<?xml version="1.0" encoding="US-ASCII"?>
<!-- DFIN New ActiveDisclosure (SM) XBRL Linkbase Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2022-11-17T07:47:10.0175+00:00 -->
<!-- Copyright (c) 2022 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple"/>
  <link:roleRef roleURI="http://xbrl.sec.gov/cef/role/SecurityOnly" xlink:href="https://xbrl.sec.gov/cef/2022/cef-2022.xsd#SecurityOnly" xlink:type="simple"/>
  <link:roleRef roleURI="http://xbrl.sec.gov/cef/role/RiskOnly" xlink:href="https://xbrl.sec.gov/cef/2022/cef-2022.xsd#RiskOnly" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfAssetsAndLiabilities" xlink:href="pflt-20220930.xsd#Role_StatementConsolidatedStatementsOfAssetsAndLiabilities" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfAssetsAndLiabilitiesParenthetical" xlink:href="pflt-20220930.xsd#Role_StatementConsolidatedStatementsOfAssetsAndLiabilitiesParenthetical" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/StatementConsolidatedStatementsOfOperations" xlink:href="pflt-20220930.xsd#StatementConsolidatedStatementsOfOperations" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows" xlink:href="pflt-20220930.xsd#Role_StatementConsolidatedStatementsOfCashFlows" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedScheduleOfInvestments" xlink:href="pflt-20220930.xsd#Role_StatementConsolidatedScheduleOfInvestments" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedScheduleOfInvestmentsParenthetical" xlink:href="pflt-20220930.xsd#Role_StatementConsolidatedScheduleOfInvestmentsParenthetical" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureOrganizationAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureOrganizationAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureAgreementsAndRelatedPartyTransactionsAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureAgreementsAndRelatedPartyTransactionsAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsScheduleOfInvestmentsAndCashAndCashEquivalentsDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsScheduleOfInvestmentsAndCashAndCashEquivalentsDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsScheduleOfInvestmentsByIndustryClassificationAndEnumeratesPercentageByFairValueOfTotalPortfolioAssetsExcludingCashAndCashEquivalentsDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsScheduleOfInvestmentsByIndustryClassificationAndEnumeratesPercentageByFairValueOfTotalPortfolioAssetsExcludingCashAndCashEquivalentsDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsSummaryOfPSSLSPortfolioAtFairValueDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsSummaryOfPSSLSPortfolioAtFairValueDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsSummaryOfListingOfPSSLSIndividualInvestmentsDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsSummaryOfListingOfPSSLSIndividualInvestmentsDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/DisclosureInvestmentsSummaryOfListingOfPsslsIndividualInvestmentsParentheticalDetails" xlink:href="pflt-20220930.xsd#DisclosureInvestmentsSummaryOfListingOfPsslsIndividualInvestmentsParentheticalDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLParentheticalDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLParentheticalDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfOperationsForPSSLDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureInvestmentsConsolidatedStatementsOfOperationsForPSSLDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfUnobservableInputsAndRangesDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfUnobservableInputsAndRangesDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfInvestmentsCashAndCashEquivalentsCreditFacilityOrPriorCreditFacilityNotesAndAssetBackedDebtDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfInvestmentsCashAndCashEquivalentsCreditFacilityOrPriorCreditFacilityNotesAndAssetBackedDebtDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfInvestmentsMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfInvestmentsMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3ParentheticalDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3ParentheticalDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsNetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsNetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureTransactionsWithAffiliatedCompaniesAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureTransactionsWithAffiliatedCompaniesAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureTransactionsWithAffiliatedCompaniesSummaryOfTransactionsWithAffiliatedCompaniesDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureTransactionsWithAffiliatedCompaniesSummaryOfTransactionsWithAffiliatedCompaniesDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureCashAndCashEquivalentsAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureCashAndCashEquivalentsAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureDebtAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureSubsequentEventsAdditionalInformationDetails" xlink:href="pflt-20220930.xsd#Role_DisclosureSubsequentEventsAdditionalInformationDetails" xlink:type="simple"/>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm" xlink:type="simple"/>
  <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/SecurityOnly">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2022/cef-2022.xsd#cef_AllSecuritiesMember" xlink:label="cef_AllSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesMember" xlink:label="pflt_TwoThousandTwentyThreeNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndTwentySixNotesMember" xlink:label="pflt_TwoThousandAndTwentySixNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityMember" xlink:label="pflt_CreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesFourPointThreePercentageMember" xlink:label="pflt_TwoThousandTwentyThreeNotesFourPointThreePercentageMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndTwentySixNotesFourPointTwoFiveMember" xlink:label="pflt_TwoThousandAndTwentySixNotesFourPointTwoFiveMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommonSharesMember" xlink:label="pflt_CommonSharesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssumesNoReturnFromNetRealizedCapitalGainsMember" xlink:label="pflt_AssumesNoReturnFromNetRealizedCapitalGainsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssumesReturnOnlyFromRealizedCapitalGainsMember" xlink:label="pflt_AssumesReturnOnlyFromRealizedCapitalGainsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2022Member" xlink:label="pflt_CreditFacilityFiscal2022Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2021Member" xlink:label="pflt_CreditFacilityFiscal2021Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2020Member" xlink:label="pflt_CreditFacilityFiscal2020Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2019Member" xlink:label="pflt_CreditFacilityFiscal2019Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2018Member" xlink:label="pflt_CreditFacilityFiscal2018Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2017Member" xlink:label="pflt_CreditFacilityFiscal2017Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2016Member" xlink:label="pflt_CreditFacilityFiscal2016Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2015Member" xlink:label="pflt_CreditFacilityFiscal2015Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2014Member" xlink:label="pflt_CreditFacilityFiscal2014Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityFiscal2013Member" xlink:label="pflt_CreditFacilityFiscal2013Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2023Fiscal2022Member" xlink:label="pflt_Notes2023Fiscal2022Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2023Fiscal2021Member" xlink:label="pflt_Notes2023Fiscal2021Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2023Fiscal2020Member" xlink:label="pflt_Notes2023Fiscal2020Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2023Fiscal2019Member" xlink:label="pflt_Notes2023Fiscal2019Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2023Fiscal2018Member" xlink:label="pflt_Notes2023Fiscal2018Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2026Fiscal2022Member" xlink:label="pflt_Notes2026Fiscal2022Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Notes2026Fiscal2021Member" xlink:label="pflt_Notes2026Fiscal2021Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebt2031Fiscal2022Member" xlink:label="pflt_AssetBackedDebt2031Fiscal2022Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebt2031Fiscal2021Member" xlink:label="pflt_AssetBackedDebt2031Fiscal2021Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebt2031Fiscal2020Member" xlink:label="pflt_AssetBackedDebt2031Fiscal2020Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebt2031Fiscal2019Member" xlink:label="pflt_AssetBackedDebt2031Fiscal2019Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandsAndThirtyTwoAssetBackedDebtMember" xlink:label="pflt_TwoThousandsAndThirtyTwoAssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NotesPayableToMembersMember" xlink:label="pflt_NotesPayableToMembersMember"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_TwoThousandTwentyThreeNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_TwoThousandAndTwentySixNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_TwoThousandTwentyThreeNotesFourPointThreePercentageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_TwoThousandAndTwentySixNotesFourPointTwoFiveMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CommonSharesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssumesNoReturnFromNetRealizedCapitalGainsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssumesReturnOnlyFromRealizedCapitalGainsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2022Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2021Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2020Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2019Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2018Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2017Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2016Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2015Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2014Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_CreditFacilityFiscal2013Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2023Fiscal2022Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2023Fiscal2021Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2023Fiscal2020Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2023Fiscal2019Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2023Fiscal2018Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2026Fiscal2022Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_Notes2026Fiscal2021Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssetBackedDebt2031Fiscal2022Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssetBackedDebt2031Fiscal2021Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssetBackedDebt2031Fiscal2020Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_AssetBackedDebt2031Fiscal2019Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_TwoThousandsAndThirtyTwoAssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllSecuritiesMember" xlink:to="pflt_NotesPayableToMembersMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/RiskOnly">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2022/cef-2022.xsd#cef_AllRisksMember" xlink:label="cef_AllRisksMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FundingIsCreditFacilityMember" xlink:label="pflt_FundingIsCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentOpportunitiesMember" xlink:label="pflt_InvestmentOpportunitiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NegativeCreditEventsMember" xlink:label="pflt_NegativeCreditEventsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnrealizedLossesMember" xlink:label="pflt_UnrealizedLossesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HireAndRetainedQualifiedInvestorsMember" xlink:label="pflt_HireAndRetainedQualifiedInvestorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChangesInInterestRatesMember" xlink:label="pflt_ChangesInInterestRatesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ReplacementOfLiborMember" xlink:label="pflt_ReplacementOfLiborMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EffectiveManagementOfFutureGrowthMember" xlink:label="pflt_EffectiveManagementOfFutureGrowthMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InformationSystemsAndSystemsFailuresMember" xlink:label="pflt_InformationSystemsAndSystemsFailuresMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NotReplicateHistoricalPerformanceOfOtherInvestmentCompaniesAndFundsMember" xlink:label="pflt_NotReplicateHistoricalPerformanceOfOtherInvestmentCompaniesAndFundsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FailureToMaintainOurStatusAsBdcMember" xlink:label="pflt_FailureToMaintainOurStatusAsBdcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LossOfRicTaxStatusMember" xlink:label="pflt_LossOfRicTaxStatusMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DifficultyInPayingAnnualDistributionRequirementMember" xlink:label="pflt_DifficultyInPayingAnnualDistributionRequirementMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LegislationRiskMember" xlink:label="pflt_LegislationRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncomeDistributionToStockholdersRiskMember" xlink:label="pflt_IncomeDistributionToStockholdersRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RegulationsRiskMember" xlink:label="pflt_RegulationsRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeverageRiskMember" xlink:label="pflt_LeverageRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestingInSharesRiskMember" xlink:label="pflt_InvestingInSharesRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsWithPreferredStockRiskMember" xlink:label="pflt_InvestmentsWithPreferredStockRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsWithDebtSecuritiesRiskMember" xlink:label="pflt_InvestmentsWithDebtSecuritiesRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NonReflectionOfCreditRatingsInDebtSecuritiesMember" xlink:label="pflt_NonReflectionOfCreditRatingsInDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarketConditionsRiskMember" xlink:label="pflt_MarketConditionsRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NotReceiveCashOnEquityInterestsFromFundingMember" xlink:label="pflt_NotReceiveCashOnEquityInterestsFromFundingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConflictsOfInterestRiskMember" xlink:label="pflt_ConflictsOfInterestRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksAssociatedWithCybersecurityAndCyberIncidentsMember" xlink:label="pflt_RisksAssociatedWithCybersecurityAndCyberIncidentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FluctuationsInQuarterlyResultsMember" xlink:label="pflt_FluctuationsInQuarterlyResultsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FutureIssueOfDebtOrOtherSecuritiesRiskMember" xlink:label="pflt_FutureIssueOfDebtOrOtherSecuritiesRiskMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FluctuationsInNAVAndMarketValueOfCommonStockWhileIssuanceOfPreferredStockDebtSecuritiesOrConvertibleDebtSecuritiesMember" xlink:label="pflt_FluctuationsInNAVAndMarketValueOfCommonStockWhileIssuanceOfPreferredStockDebtSecuritiesOrConvertibleDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RestrictionsOnAbilityToSellInvestmentsMember" xlink:label="pflt_RestrictionsOnAbilityToSellInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FluctuationsInTradingMarketOrMarketValueOfPubliclyIssuedDebtOrConvertibleDebtSecuritiesMember" xlink:label="pflt_FluctuationsInTradingMarketOrMarketValueOfPubliclyIssuedDebtOrConvertibleDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermsRelatingToDebtRedemptionAdverselyEffectOnReturnOnDebtSecuritiesMember" xlink:label="pflt_TermsRelatingToDebtRedemptionAdverselyEffectOnReturnOnDebtSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskInIssuingSubscriptionRightsOfWarrantsForCommonStockMember" xlink:label="pflt_RiskInIssuingSubscriptionRightsOfWarrantsForCommonStockMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskInImpactOfRecentFinancialReformLegislationMember" xlink:label="pflt_RiskInImpactOfRecentFinancialReformLegislationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToChangesInLawsOrRegulationsMember" xlink:label="pflt_RiskRelatedToChangesInLawsOrRegulationsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskInChangingInvestmentObjectivesOperatingPoliciesAndStrategiesWithoutPriorNoticeOrStockholderApprovalMember" xlink:label="pflt_RiskInChangingInvestmentObjectivesOperatingPoliciesAndStrategiesWithoutPriorNoticeOrStockholderApprovalMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskInSubjectToStockholderActivismMember" xlink:label="pflt_RiskInSubjectToStockholderActivismMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskInInvestingIlliquidAssetsMember" xlink:label="pflt_RiskInInvestingIlliquidAssetsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToLackOfLiquidityInInvestmentsMember" xlink:label="pflt_RiskRelatedToLackOfLiquidityInInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToGeneralDisruptionInCreditMarketsMember" xlink:label="pflt_RiskRelatedToGeneralDisruptionInCreditMarketsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToInvestInOverTheCounterSecuritiesMember" xlink:label="pflt_RiskRelatedToInvestInOverTheCounterSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToInvestmentsInProspectivePortfolioCompaniesMember" xlink:label="pflt_RiskRelatedToInvestmentsInProspectivePortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToInvestmentsInNonQualifyingAssetsMember" xlink:label="pflt_RiskRelatedToInvestmentsInNonQualifyingAssetsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskOccurredDueToNonDiversifiedInvestmentCompanyMember" xlink:label="pflt_RiskOccurredDueToNonDiversifiedInvestmentCompanyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToEconomicRecessionsOrDownturnsMember" xlink:label="pflt_RiskRelatedToEconomicRecessionsOrDownturnsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FollowOnInvestmentsInPortfolioMember" xlink:label="pflt_FollowOnInvestmentsInPortfolioMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ControllingEquityInterestsInPortfolioMember" xlink:label="pflt_ControllingEquityInterestsInPortfolioMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentStrategyOnPrivatelyHeldIncludingControllingEquityInterestsMember" xlink:label="pflt_InvestmentStrategyOnPrivatelyHeldIncludingControllingEquityInterestsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToDebtInvestmentsMember" xlink:label="pflt_RisksRelatingToDebtInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToIncentiveFeePayableInduceToInvestmentAdviserMember" xlink:label="pflt_RisksRelatingToIncentiveFeePayableInduceToInvestmentAdviserMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToDistressedDebtInvestmentsMember" xlink:label="pflt_RisksRelatingToDistressedDebtInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToInvestmentsInForeignSecuritiesMember" xlink:label="pflt_RisksRelatingToInvestmentsInForeignSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToInvestmentsMember" xlink:label="pflt_RisksRelatingToInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToObligationToPayInvestmentAdviserIncentiveCompensationMember" xlink:label="pflt_RisksRelatingToObligationToPayInvestmentAdviserIncentiveCompensationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatedToUseOfLeverageMember" xlink:label="pflt_RisksRelatedToUseOfLeverageMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToIssuanceOfSharesOfCommonStockAtPriceBelowCurrentNavPerShareMember" xlink:label="pflt_RiskRelatedToIssuanceOfSharesOfCommonStockAtPriceBelowCurrentNavPerShareMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToDistributionsMember" xlink:label="pflt_RiskRelatedToDistributionsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToInvestmentInSharesMember" xlink:label="pflt_RiskRelatedToInvestmentInSharesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToSaleOfSecuritiesMember" xlink:label="pflt_RiskRelatedToSaleOfSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToNetProceedsFromOfferingOfSecuritiesMember" xlink:label="pflt_RiskRelatedToNetProceedsFromOfferingOfSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToTradingOfSharesAtDiscountFromNavOrPremiumUnsustainableOverLongTermMember" xlink:label="pflt_RiskRelatedToTradingOfSharesAtDiscountFromNavOrPremiumUnsustainableOverLongTermMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToFluctationInCommonStockMarketPriceMember" xlink:label="pflt_RiskRelatedToFluctationInCommonStockMarketPriceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToInvestingNetProceedsRaisedFromOfferingsMember" xlink:label="pflt_RiskRelatedToInvestingNetProceedsRaisedFromOfferingsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToPaymentOfTaxesInExcessOfCashReceivedAsDistributionsMember" xlink:label="pflt_RiskRelatedToPaymentOfTaxesInExcessOfCashReceivedAsDistributionsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToProvisionsOfMarylandGeneralCorporationLawCharterAndBylawsMember" xlink:label="pflt_RiskRelatedToProvisionsOfMarylandGeneralCorporationLawCharterAndBylawsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToTwentyTwentyThreeNotesMember" xlink:label="pflt_RisksRelatingToTwentyTwentyThreeNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RisksRelatingToTwentyTwentySixNotesMember" xlink:label="pflt_RisksRelatingToTwentyTwentySixNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiskRelatedToDebtSecuritizationMember" xlink:label="pflt_RiskRelatedToDebtSecuritizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImpactOnPortfolioAndValueOfInvestmentDueToGlobalPoliticalAndEconomicUncertaintyMember" xlink:label="pflt_ImpactOnPortfolioAndValueOfInvestmentDueToGlobalPoliticalAndEconomicUncertaintyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InflationMember" xlink:label="pflt_InflationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImpactOfGlobalCapitalMarketConditionsMember" xlink:label="pflt_ImpactOfGlobalCapitalMarketConditionsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnitedKingdomWithdrawalFromEuropeanUnionMember" xlink:label="pflt_UnitedKingdomWithdrawalFromEuropeanUnionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CovidNineteenPandemicMember" xlink:label="pflt_CovidNineteenPandemicMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_VolatilityOrProlongedDisruptionInCreditMarketsMember" xlink:label="pflt_VolatilityOrProlongedDisruptionInCreditMarketsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FinancialAndEconomicMarketUncertaintyDueToPublicHealthEmergencyMember" xlink:label="pflt_FinancialAndEconomicMarketUncertaintyDueToPublicHealthEmergencyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EconomicSanctionLawsFromTransactingMember" xlink:label="pflt_EconomicSanctionLawsFromTransactingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LitigationMember" xlink:label="pflt_LitigationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EffectOfGlobalClimateChangeMember" xlink:label="pflt_EffectOfGlobalClimateChangeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LegislativeOrRegulatoryTaxChangesMember" xlink:label="pflt_LegislativeOrRegulatoryTaxChangesMember"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FundingIsCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InvestmentOpportunitiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_NegativeCreditEventsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_UnrealizedLossesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_HireAndRetainedQualifiedInvestorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ChangesInInterestRatesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ReplacementOfLiborMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_EffectiveManagementOfFutureGrowthMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InformationSystemsAndSystemsFailuresMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_NotReplicateHistoricalPerformanceOfOtherInvestmentCompaniesAndFundsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FailureToMaintainOurStatusAsBdcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_LossOfRicTaxStatusMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_DifficultyInPayingAnnualDistributionRequirementMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_LegislationRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_IncomeDistributionToStockholdersRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RegulationsRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_LeverageRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InvestingInSharesRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InvestmentsWithPreferredStockRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InvestmentsWithDebtSecuritiesRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_NonReflectionOfCreditRatingsInDebtSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_MarketConditionsRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_NotReceiveCashOnEquityInterestsFromFundingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ConflictsOfInterestRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksAssociatedWithCybersecurityAndCyberIncidentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FluctuationsInQuarterlyResultsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FutureIssueOfDebtOrOtherSecuritiesRiskMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FluctuationsInNAVAndMarketValueOfCommonStockWhileIssuanceOfPreferredStockDebtSecuritiesOrConvertibleDebtSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RestrictionsOnAbilityToSellInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FluctuationsInTradingMarketOrMarketValueOfPubliclyIssuedDebtOrConvertibleDebtSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_TermsRelatingToDebtRedemptionAdverselyEffectOnReturnOnDebtSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskInIssuingSubscriptionRightsOfWarrantsForCommonStockMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskInImpactOfRecentFinancialReformLegislationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToChangesInLawsOrRegulationsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskInChangingInvestmentObjectivesOperatingPoliciesAndStrategiesWithoutPriorNoticeOrStockholderApprovalMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskInSubjectToStockholderActivismMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskInInvestingIlliquidAssetsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToLackOfLiquidityInInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToGeneralDisruptionInCreditMarketsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToInvestInOverTheCounterSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToInvestmentsInProspectivePortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToInvestmentsInNonQualifyingAssetsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskOccurredDueToNonDiversifiedInvestmentCompanyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToEconomicRecessionsOrDownturnsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="44" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FollowOnInvestmentsInPortfolioMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="45" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ControllingEquityInterestsInPortfolioMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="46" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InvestmentStrategyOnPrivatelyHeldIncludingControllingEquityInterestsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="47" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToDebtInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="48" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToIncentiveFeePayableInduceToInvestmentAdviserMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="49" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToDistressedDebtInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="50" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToInvestmentsInForeignSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="51" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="52" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToObligationToPayInvestmentAdviserIncentiveCompensationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="53" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatedToUseOfLeverageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="54" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToIssuanceOfSharesOfCommonStockAtPriceBelowCurrentNavPerShareMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="55" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToDistributionsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="56" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToInvestmentInSharesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="57" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToSaleOfSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="58" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToNetProceedsFromOfferingOfSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="59" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToTradingOfSharesAtDiscountFromNavOrPremiumUnsustainableOverLongTermMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="60" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToFluctationInCommonStockMarketPriceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="61" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToInvestingNetProceedsRaisedFromOfferingsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="62" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToPaymentOfTaxesInExcessOfCashReceivedAsDistributionsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="63" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToProvisionsOfMarylandGeneralCorporationLawCharterAndBylawsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="64" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToTwentyTwentyThreeNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="65" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RisksRelatingToTwentyTwentySixNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="66" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_RiskRelatedToDebtSecuritizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="67" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ImpactOnPortfolioAndValueOfInvestmentDueToGlobalPoliticalAndEconomicUncertaintyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="68" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_InflationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="69" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_ImpactOfGlobalCapitalMarketConditionsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="70" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_UnitedKingdomWithdrawalFromEuropeanUnionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="71" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_CovidNineteenPandemicMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="72" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_VolatilityOrProlongedDisruptionInCreditMarketsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="73" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_FinancialAndEconomicMarketUncertaintyDueToPublicHealthEmergencyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="74" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_EconomicSanctionLawsFromTransactingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="75" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_LitigationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="76" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_EffectOfGlobalClimateChangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="77" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cef_AllRisksMember" xlink:to="pflt_LegislativeOrRegulatoryTaxChangesMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfAssetsAndLiabilities">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationDomain" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:label="us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationAxis" xlink:label="us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationDomain" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesPayableMember" xlink:label="pflt_TwoThousandTwentyThreeNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:label="us-gaap_InvestmentsFairValueDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtFairValue" xlink:label="us-gaap_InvestmentOwnedAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract" xlink:label="us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributionsPayable" xlink:label="pflt_DistributionsPayable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="us-gaap_StockholdersEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockValue" xlink:label="us-gaap_CommonStockValue"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentySixNotesPayableMember" xlink:label="pflt_TwoThousandTwentySixNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PayableForInvestmentsPurchased" xlink:label="pflt_PayableForInvestmentsPurchased"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestReceivable" xlink:label="us-gaap_InterestReceivable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ReceivableForInvestmentsSold" xlink:label="pflt_ReceivableForInvestmentsSold"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermNotesPayable" xlink:label="us-gaap_LongTermNotesPayable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity" xlink:label="us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpenseAndOtherAssets" xlink:label="us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtNet" xlink:label="pflt_AssetBackedDebtNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetAssetValuePerShare" xlink:label="us-gaap_NetAssetValuePerShare"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ManagementFeePayable" xlink:label="us-gaap_ManagementFeePayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PerformanceBasedIncentiveFeePayable" xlink:label="pflt_PerformanceBasedIncentiveFeePayable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentUnaffiliatedIssuerMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentIssuerAffiliationAxis" xlink:to="us-gaap_InvestmentIssuerAffiliationDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InvestmentIssuerAffiliationAxis" xlink:to="us-gaap_InvestmentIssuerAffiliationDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_InvestmentIssuerAffiliationAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TwoThousandTwentyThreeNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AssetsAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_InvestmentsFairValueDisclosureAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:to="us-gaap_InvestmentOwnedAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_DistributionsPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_CommonStockValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TwoThousandTwentySixNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Assets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_PayableForInvestmentsPurchased" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_AdditionalPaidInCapitalCommonStock" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerControlledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:to="us-gaap_InterestReceivable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LineOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommitmentsAndContingencies" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:to="pflt_ReceivableForInvestmentsSold" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LongTermNotesPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsFairValueDisclosureAbstract" xlink:to="us-gaap_PrepaidExpenseAndOtherAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_AssetBackedDebtNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_InterestPayableCurrentAndNoncurrent" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetAssetValuePerShare" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_ManagementFeePayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_PerformanceBasedIncentiveFeePayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_DeferredIncomeTaxLiabilitiesNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_Liabilities" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfAssetsAndLiabilitiesParenthetical">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationDomain" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:label="us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationAxis" xlink:label="us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesPayableMember" xlink:label="pflt_TwoThousandTwentyThreeNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtCost" xlink:label="us-gaap_InvestmentOwnedAtCost"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentySixNotesPayableMember" xlink:label="pflt_TwoThousandTwentySixNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CashAndCashEquivalentsAtCost" xlink:label="pflt_CashAndCashEquivalentsAtCost"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LineOfCreditAtCost" xlink:label="pflt_LineOfCreditAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LongTermNotesPayableAtCost" xlink:label="pflt_LongTermNotesPayableAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtNetPar" xlink:label="pflt_AssetBackedDebtNetPar"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesIssued" xlink:label="us-gaap_CommonStockSharesIssued"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentUnaffiliatedIssuerMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentIssuerAffiliationAxis" xlink:to="us-gaap_InvestmentIssuerAffiliationDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_InvestmentIssuerAffiliationAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TwoThousandTwentyThreeNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_InvestmentOwnedAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TwoThousandTwentySixNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_CashAndCashEquivalentsAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerControlledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_LineOfCreditAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_LongTermNotesPayableAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_AssetBackedDebtNetPar" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesIssued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesOutstanding" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesAuthorized" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/StatementConsolidatedStatementsOfOperations">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationDomain" xlink:label="us-gaap_InvestmentIssuerAffiliationDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentUnaffiliatedIssuerMember" xlink:label="us-gaap_InvestmentUnaffiliatedIssuerMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentIssuerAffiliationAxis" xlink:label="us-gaap_InvestmentIssuerAffiliationAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetInvestmentIncomeAbstract" xlink:label="us-gaap_NetInvestmentIncomeAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ManagementFeeExpense" xlink:label="us-gaap_ManagementFeeExpense"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetRealizedAndUnrealizedGainLossAbstract" xlink:label="pflt_NetRealizedAndUnrealizedGainLossAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetRealizedGainLossOnNonControlledNonAffiliatedInvestments" xlink:label="pflt_NetRealizedGainLossOnNonControlledNonAffiliatedInvestments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationNonControlledNonAffiliatedInvestments" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationNonControlledNonAffiliatedInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeDividend" xlink:label="us-gaap_InvestmentIncomeDividend"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncentiveFeeExpense" xlink:label="us-gaap_IncentiveFeeExpense"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract" xlink:label="pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetRealizedGainLossOnNonControlledAndControlledAffiliatedInvestments" xlink:label="pflt_NetRealizedGainLossOnNonControlledAndControlledAffiliatedInvestments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationControlledAndNonControlledAffiliatedInvestments" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationControlledAndNonControlledAffiliatedInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022q3/us-gaap-sup-2022q3.xsd#us-gaap_InvestmentAffiliatedIssuerControlledMember" xlink:label="us-gaap_InvestmentAffiliatedIssuerControlledMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProvisionForTaxesOnUnrealizedAppreciationOnInvestments" xlink:label="pflt_ProvisionForTaxesOnUnrealizedAppreciationOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIncome" xlink:label="us-gaap_OtherIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestAndDebtExpense" xlink:label="us-gaap_InterestAndDebtExpense"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnInvestments" xlink:label="us-gaap_GainLossOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="us-gaap_InvestmentIncomeNonoperating"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInChangeInUnrealizedDepreciationAppreciationOnDebt" xlink:label="pflt_NetChangeInChangeInUnrealizedDepreciationAppreciationOnDebt"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherSellingGeneralAndAdministrativeExpense" xlink:label="us-gaap_OtherSellingGeneralAndAdministrativeExpense"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt" xlink:label="pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ExpensesBeforeAmendmentCostsDebtIssuanceCostsAndProvisionForTaxes" xlink:label="pflt_ExpensesBeforeAmendmentCostsDebtIssuanceCostsAndProvisionForTaxes"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetInvestmentIncome" xlink:label="us-gaap_NetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" xlink:label="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease" xlink:label="us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityAmendmentCostsAndDebtIssuanceCosts" xlink:label="pflt_CreditFacilityAmendmentCostsAndDebtIssuanceCosts"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProvisionForTaxesOnNetInvestmentIncome" xlink:label="pflt_ProvisionForTaxesOnNetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpenses" xlink:label="us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentUnaffiliatedIssuerMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentIssuerAffiliationAxis" xlink:to="us-gaap_InvestmentIssuerAffiliationDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_InvestmentIssuerAffiliationAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetInvestmentIncomeAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_InvestmentIncomeInterest" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_ManagementFeeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetRealizedAndUnrealizedGainLossAbstract" xlink:to="pflt_NetRealizedGainLossOnNonControlledNonAffiliatedInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationNonControlledNonAffiliatedInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerNoncontrolledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_InvestmentIncomeDividend" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_IncentiveFeeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetRealizedAndUnrealizedGainLossAbstract" xlink:to="pflt_NetRealizedGainLossOnNonControlledAndControlledAffiliatedInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationControlledAndNonControlledAffiliatedInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentIssuerAffiliationDomain" xlink:to="us-gaap_InvestmentAffiliatedIssuerControlledMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_ProvisionForTaxesOnUnrealizedAppreciationOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_OtherIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_InterestAndDebtExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_NetRealizedAndUnrealizedGainLossAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetRealizedAndUnrealizedGainLossAbstract" xlink:to="us-gaap_GainLossOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_InvestmentIncomeNonoperating" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInChangeInUnrealizedDepreciationAppreciationOnDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_GeneralAndAdministrativeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_OperatingExpensesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OtherSellingGeneralAndAdministrativeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossFromOperationsPerShare" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="pflt_ExpensesBeforeAmendmentCostsDebtIssuanceCostsAndProvisionForTaxes" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_NetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_InvestmentCompanyInvestmentIncomeLossPerShare" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="pflt_CreditFacilityAmendmentCostsAndDebtIssuanceCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="pflt_ProvisionForTaxesOnNetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_CostsAndExpenses" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlows">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesMember" xlink:label="pflt_TwoThousandTwentyThreeNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss" xlink:label="us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestPaidNet" xlink:label="us-gaap_InterestPaidNet"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentySixMember" xlink:label="pflt_TwoThousandTwentySixMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnDebt" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnDebt"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfStockIssuanceCosts" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="us-gaap_IncomeTaxesPaidNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentCompanyDeferredIncomeTaxUnrealizedAppreciation" xlink:label="us-gaap_InvestmentCompanyDeferredIncomeTaxUnrealizedAppreciation"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandThirtyOneAssetBackedDebtMember" xlink:label="pflt_TwoThousandThirtyOneAssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfDividends" xlink:label="us-gaap_PaymentsOfDividends"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NonCashExchangesAndConversions" xlink:label="pflt_NonCashExchangesAndConversions"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="us-gaap_RealizedInvestmentGainsLosses"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="us-gaap_ProceedsFromDebtNetOfIssuanceCosts"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities" xlink:label="us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromLinesOfCredit" xlink:label="us-gaap_ProceedsFromLinesOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PaymentInKindIncome" xlink:label="pflt_PaymentInKindIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities" xlink:label="us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="us-gaap_AmortizationOfFinancingCosts"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet" xlink:label="us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncreaseDecreaseInReceivablesFromInvestmentsSold" xlink:label="pflt_IncreaseDecreaseInReceivablesFromInvestmentsSold"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPrepaidExpensesOther" xlink:label="us-gaap_IncreaseDecreaseInPrepaidExpensesOther"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncreaseDecreaseInPayableForInvestmentsPurchased" xlink:label="pflt_IncreaseDecreaseInPayableForInvestmentsPurchased"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet" xlink:label="us-gaap_IncreaseDecreaseInInterestPayableNet"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncreaseDecreaseInBaseManagementFeePayable" xlink:label="pflt_IncreaseDecreaseInBaseManagementFeePayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncreaseDecreaseInPerformanceBasedIncentiveFeePayable" xlink:label="pflt_IncreaseDecreaseInPerformanceBasedIncentiveFeePayable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" xlink:label="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_TwoThousandTwentyThreeNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProfitLoss" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromIssuanceInitialPublicOffering" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_InterestPaidNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_TwoThousandTwentySixMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_PaymentsOfStockIssuanceCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_IncomeTaxesPaidNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_InvestmentCompanyDeferredIncomeTaxUnrealizedAppreciation" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_TwoThousandThirtyOneAssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_PaymentsOfDividends" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="pflt_NonCashExchangesAndConversions" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_RealizedInvestmentGainsLosses" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_PaymentsOfDebtIssuanceCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromDebtNetOfIssuanceCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromLinesOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_PaymentInKindIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfLinesOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_AmortizationOfFinancingCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccruedInterestReceivableNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_IncreaseDecreaseInReceivablesFromInvestmentsSold" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInPrepaidExpensesOther" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_IncreaseDecreaseInPayableForInvestmentsPurchased" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInInterestPayableNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_IncreaseDecreaseInBaseManagementFeePayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="pflt_IncreaseDecreaseInPerformanceBasedIncentiveFeePayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedScheduleOfInvestments">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtMember" xlink:label="pflt_FirstLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="srt_EquityMethodInvesteeNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="srt_EquityMethodInvesteeNameDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdNetAcquisitionLLCMember" xlink:label="pflt_AdNetAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="us-gaap_RevolvingCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesByIndustryAxis" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="us-gaap_EquitySecuritiesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="us-gaap_EquitySecuritiesIndustryMember_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaMember" xlink:label="pflt_MediaMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockMember" xlink:label="us-gaap_PreferredStockMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:label="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnfundedLoanCommitmentMember" xlink:label="us-gaap_UnfundedLoanCommitmentMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="us-gaap_StatementClassOfStockAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="us-gaap_ClassOfStockDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="us-gaap_ClassOfStockDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SuperSeniorPreferredEquityMember" xlink:label="pflt_SuperSeniorPreferredEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentMaturityDate" xlink:label="us-gaap_InvestmentMaturityDate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AltamiraTechnologiesLLCMember" xlink:label="pflt_AltamiraTechnologiesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanTwoMember" xlink:label="pflt_TermLoanTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaOneMember" xlink:label="pflt_MediaOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSecuredDebtMember" xlink:label="pflt_SecondLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommonEquityWarrantsMember" xlink:label="pflt_CommonEquityWarrantsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeniorPreferredEquityMember" xlink:label="pflt_SeniorPreferredEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IndustryName" xlink:label="pflt_IndustryName"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesExcludingCashAndCashEquivalentMember" xlink:label="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesExcludingCashAndCashEquivalentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommonEquityMember" xlink:label="pflt_CommonEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaThreeMember" xlink:label="pflt_MediaThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AmericanInsulatedGlassLLCMember" xlink:label="pflt_AmericanInsulatedGlassLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanBMember" xlink:label="pflt_TermLoanBMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityInterestsMember" xlink:label="pflt_EquityInterestsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassAMember" xlink:label="us-gaap_CommonClassAMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentInterestRate" xlink:label="us-gaap_InvestmentInterestRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentExcludingCashAndCashEquivalentMember" xlink:label="pflt_InvestmentExcludingCashAndCashEquivalentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITServicesMember" xlink:label="pflt_ITServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AmericanTeleconferencingServicesLtdMember" xlink:label="pflt_AmericanTeleconferencingServicesLtdMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanCMember" xlink:label="pflt_TermLoanCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonClassBMember" xlink:label="us-gaap_CommonClassBMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtFortyThreePointSevenPercentageMember" xlink:label="pflt_FirstLienSecuredDebtFortyThreePointSevenPercentageMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentPaymentInKindInterestRate" xlink:label="pflt_InvestmentPaymentInKindInterestRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITServicesOneMember" xlink:label="pflt_ITServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AmsiveHoldingCorporationMember" xlink:label="pflt_AmsiveHoldingCorporationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanOneMember" xlink:label="pflt_TermLoanOneMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SuperPriorityFirstLienTermLoanMember" xlink:label="pflt_SuperPriorityFirstLienTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityInterestsTwelvePointOnePercentageMember" xlink:label="pflt_EquityInterestsTwelvePointOnePercentageMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateTerms" xlink:label="us-gaap_DebtInstrumentInterestRateTerms"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DebtInstrumentInterestParAmount" xlink:label="pflt_DebtInstrumentInterestParAmount"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITServicesTwoMember" xlink:label="pflt_ITServicesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnteriadLlcFKAMeritDirectLlcMember" xlink:label="pflt_AnteriadLlcFKAMeritDirectLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanMember" xlink:label="pflt_TermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsAndCashEquivalentsMember" xlink:label="pflt_InvestmentsAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SuperPriorityFirstLienMember" xlink:label="pflt_SuperPriorityFirstLienMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BuildingProductsMember" xlink:label="pflt_BuildingProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesAOnePreferredEquityMember" xlink:label="pflt_SeriesAOnePreferredEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OnePointFiveLienTermLoanMember" xlink:label="pflt_OnePointFiveLienTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnteriadHoldingsLpFKAMeritdirectHoldingsLpMember" xlink:label="pflt_AnteriadHoldingsLpFKAMeritdirectHoldingsLpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedBalanceShares" xlink:label="us-gaap_InvestmentOwnedBalanceShares"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TelecommunicationsMember" xlink:label="pflt_TelecommunicationsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnfundedTermLoanMember" xlink:label="pflt_UnfundedTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesAAPreferredEquityMember" xlink:label="pflt_SeriesAAPreferredEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnyHourServicesMember" xlink:label="pflt_AnyHourServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentOwnedBalanceParValue" xlink:label="pflt_InvestmentOwnedBalanceParValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TelecommunicationsOneMember" xlink:label="pflt_TelecommunicationsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesBCommonEquityMember" xlink:label="pflt_SeriesBCommonEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ApexServicePartnersLLCMember" xlink:label="pflt_ApexServicePartnersLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtCost" xlink:label="us-gaap_InvestmentOwnedAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TelecommunicationsTwoMember" xlink:label="pflt_TelecommunicationsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ApiTechnologiesCorpMember" xlink:label="pflt_ApiTechnologiesCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtFairValue" xlink:label="us-gaap_InvestmentOwnedAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnergyEquipmentAndServicesMember" xlink:label="pflt_EnergyEquipmentAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_APIHoldingIIICorpMember" xlink:label="pflt_APIHoldingIIICorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LiabilitiesInExcessOfOtherAssets" xlink:label="pflt_LiabilitiesInExcessOfOtherAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnergyEquipmentAndServicesOneMember" xlink:label="pflt_EnergyEquipmentAndServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AppliedTechnicalServicesLLCMember" xlink:label="pflt_AppliedTechnicalServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsNet" xlink:label="us-gaap_AssetsNet"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnergyEquipmentAndServicesTwoMember" xlink:label="pflt_EnergyEquipmentAndServicesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ArcfieldAcquisitionCorpMember" xlink:label="pflt_ArcfieldAcquisitionCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BetaPlusTechnologiesIncMember" xlink:label="pflt_BetaPlusTechnologiesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesMember" xlink:label="pflt_DiversifiedConsumerServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BlackhawkIndustrialDistributionIncMember" xlink:label="pflt_BlackhawkIndustrialDistributionIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesOneMember" xlink:label="pflt_DiversifiedConsumerServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BroderBrosCoMember" xlink:label="pflt_BroderBrosCoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesTwoMember" xlink:label="pflt_DiversifiedConsumerServicesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BurgessPointHoldingsLpMember" xlink:label="pflt_BurgessPointHoldingsLpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesThreeMember" xlink:label="pflt_DiversifiedConsumerServicesThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesFourMember" xlink:label="pflt_DiversifiedConsumerServicesFourMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ByLightProfessionalITServicesLLCMember" xlink:label="pflt_ByLightProfessionalITServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesFiveMember" xlink:label="pflt_DiversifiedConsumerServicesFiveMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CadenceAerospaceLLCMember" xlink:label="pflt_CadenceAerospaceLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CanoHealthLLCMember" xlink:label="pflt_CanoHealthLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesMember" xlink:label="pflt_CommercialServicesAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CF512IncMember" xlink:label="pflt_CF512IncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesOneMember" xlink:label="pflt_CommercialServicesAndSuppliesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CHAHoldingsIncMember" xlink:label="pflt_CHAHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChallengerPerformanceOptimizationIncMember" xlink:label="pflt_ChallengerPerformanceOptimizationIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesTwoMember" xlink:label="pflt_CommercialServicesAndSuppliesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CompexLegalServicesIncMember" xlink:label="pflt_CompexLegalServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesThreeMember" xlink:label="pflt_CommercialServicesAndSuppliesThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConnatixBuyerIncMember" xlink:label="pflt_ConnatixBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AerospaceAndDefenseMember" xlink:label="pflt_AerospaceAndDefenseMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Crane1ServicesIncMember" xlink:label="pflt_Crane1ServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InternetSoftwareAndServicesMember" xlink:label="pflt_InternetSoftwareAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InternetSoftwareAndServicesOneMember" xlink:label="pflt_InternetSoftwareAndServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CrashChampionsLLCMember" xlink:label="pflt_CrashChampionsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DouglasProductsAndPackagingCompanyLLCMember" xlink:label="pflt_DouglasProductsAndPackagingCompanyLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsMember" xlink:label="pflt_DistributorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DouglasSewerIntermediateLLCMember" xlink:label="pflt_DouglasSewerIntermediateLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsOneMember" xlink:label="pflt_DistributorsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DrSquatchLLCMember" xlink:label="pflt_DrSquatchLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsTwoMember" xlink:label="pflt_DistributorsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DRSHoldingsIIIIncMember" xlink:label="pflt_DRSHoldingsIIIIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TextilesApparelAndLuxuryGoodsMember" xlink:label="pflt_TextilesApparelAndLuxuryGoodsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DuracoSpecialtyTapesLLCMember" xlink:label="pflt_DuracoSpecialtyTapesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HighTechIndustriesMember" xlink:label="pflt_HighTechIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECLEntertainmentLLCMember" xlink:label="pflt_ECLEntertainmentLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HighTechIndustriesOneMember" xlink:label="pflt_HighTechIndustriesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECMIndustriesLLCMember" xlink:label="pflt_ECMIndustriesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HighTechIndustriesTwoMember" xlink:label="pflt_HighTechIndustriesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AerospaceAndDefenseOneMember" xlink:label="pflt_AerospaceAndDefenseOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECommissionFinancialServicesIncMember" xlink:label="pflt_ECommissionFinancialServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaTwoMember" xlink:label="pflt_MediaTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EfficientCollaborativeRetailMarketingCompanyLLCMember" xlink:label="pflt_EfficientCollaborativeRetailMarketingCompanyLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnvironmentalIndustriesMember" xlink:label="pflt_EnvironmentalIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ExigoIntermediateIILLCMember" xlink:label="pflt_ExigoIntermediateIILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BusinessServicesMember" xlink:label="pflt_BusinessServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FindexGroupLimitedMember" xlink:label="pflt_FindexGroupLimitedMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BusinessServicesOneMember" xlink:label="pflt_BusinessServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GantechAcquisitionCorpMember" xlink:label="pflt_GantechAcquisitionCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProfessionalServicesMember" xlink:label="pflt_ProfessionalServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GlobalHoldingsInterCoLLCMember" xlink:label="pflt_GlobalHoldingsInterCoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProfessionalServicesOneMember" xlink:label="pflt_ProfessionalServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GraffitiBuyerIncMember" xlink:label="pflt_GraffitiBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HancockRoofingAndConstructionLLCMember" xlink:label="pflt_HancockRoofingAndConstructionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProfessionalServicesTwoMember" xlink:label="pflt_ProfessionalServicesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HoldcoSandsIntermediateLLCMember" xlink:label="pflt_HoldcoSandsIntermediateLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthProvidersAndServicesMember" xlink:label="pflt_HealthProvidersAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HWHoldcoLLCMember" xlink:label="pflt_HWHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AutomobilesMember" xlink:label="us-gaap_AutomobilesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IDCInfusionServicesIncMember" xlink:label="pflt_IDCInfusionServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChemicalsPlasticsAndRubberMember" xlink:label="pflt_ChemicalsPlasticsAndRubberMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IGInvestmentsHoldingsLLCMember" xlink:label="pflt_IGInvestmentsHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChemicalsPlasticsAndRubberOneMember" xlink:label="pflt_ChemicalsPlasticsAndRubberOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImagineAcquisitioncoLLCMember" xlink:label="pflt_ImagineAcquisitioncoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChemicalsPlasticsAndRubberTwoMember" xlink:label="pflt_ChemicalsPlasticsAndRubberTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InceptionFertilityVenturesLLCMember" xlink:label="pflt_InceptionFertilityVenturesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PersonalProductsMember" xlink:label="pflt_PersonalProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InfolinksMediaBuycoLLCMember" xlink:label="pflt_InfolinksMediaBuycoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PersonalProductsOneMember" xlink:label="pflt_PersonalProductsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IntegrativeNutritionLLCMember" xlink:label="pflt_IntegrativeNutritionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PersonalProductsTwoMember" xlink:label="pflt_PersonalProductsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IntegrityMarketingAcquisitionLLCMember" xlink:label="pflt_IntegrityMarketingAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelGamingAndLeisureMember" xlink:label="pflt_HotelGamingAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITIHoldingsIncMember" xlink:label="pflt_ITIHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ContainersAndPackagingMember" xlink:label="pflt_ContainersAndPackagingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_K2PureSolutionsNoCalLPMember" xlink:label="pflt_K2PureSolutionsNoCalLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelsRestaurantsAndLeisureMember" xlink:label="pflt_HotelsRestaurantsAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_KineticPurchaserLLCMember" xlink:label="pflt_KineticPurchaserLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsOneMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LashOpCoLLCMember" xlink:label="pflt_LashOpCoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BankingFinanceInsuranceAndRealEstateMember" xlink:label="pflt_BankingFinanceInsuranceAndRealEstateMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LAVGearHoldingsIncMember" xlink:label="pflt_LAVGearHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BankingFinanceInsuranceAndRealEstateOneMember" xlink:label="pflt_BankingFinanceInsuranceAndRealEstateOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LedgeLoungerIncMember" xlink:label="pflt_LedgeLoungerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BankingFinanceInsuranceAndRealEstateTwoMember" xlink:label="pflt_BankingFinanceInsuranceAndRealEstateTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LightspeedBuyerIncMember" xlink:label="pflt_LightspeedBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionMember" xlink:label="pflt_MediaDiversifiedAndProductionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LuckyBucksLLCMember" xlink:label="pflt_LuckyBucksLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionTwoMember" xlink:label="pflt_MediaDiversifiedAndProductionTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SoftwareMember" xlink:label="pflt_SoftwareMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MAGDSCorpMember" xlink:label="pflt_MAGDSCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SoftwareOneMember" xlink:label="pflt_SoftwareOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarsAcquisitionHoldingsCorpMember" xlink:label="pflt_MarsAcquisitionHoldingsCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SoftwareTwoMember" xlink:label="pflt_SoftwareTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PRAEventsIncMember" xlink:label="pflt_PRAEventsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedFinancialServicesMember" xlink:label="pflt_DiversifiedFinancialServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MBSHoldingsIncMember" xlink:label="pflt_MBSHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TradingCompaniesAndDistributorsMember" xlink:label="pflt_TradingCompaniesAndDistributorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MdiBuyerIncMember" xlink:label="pflt_MdiBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MdiAggregatorLpMember" xlink:label="pflt_MdiAggregatorLpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TradingCompaniesAndDistributorsOneMember" xlink:label="pflt_TradingCompaniesAndDistributorsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeadowlarkAcquirerLLCMember" xlink:label="pflt_MeadowlarkAcquirerLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TradingCompaniesAndDistributorsTwoMember" xlink:label="pflt_TradingCompaniesAndDistributorsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeritDirectLLCMember" xlink:label="pflt_MeritDirectLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceMember" xlink:label="pflt_InsuranceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceOneMember" xlink:label="pflt_InsuranceOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MissionCriticalElectronicsIncMember" xlink:label="pflt_MissionCriticalElectronicsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MunicipalEmergencyServicesIncMember" xlink:label="pflt_MunicipalEmergencyServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceTwoMember" xlink:label="pflt_InsuranceTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NBHGroupLLCMember" xlink:label="pflt_NBHGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceThreeMember" xlink:label="pflt_InsuranceThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OISManagementServicesLLCMember" xlink:label="pflt_OISManagementServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEquipmentAndSuppliesMember" xlink:label="pflt_HealthcareEquipmentAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OneStopMailingLLCMember" xlink:label="pflt_OneStopMailingLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEquipmentAndSuppliesOneMember" xlink:label="pflt_HealthcareEquipmentAndSuppliesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ORLAcquisitionIncMember" xlink:label="pflt_ORLAcquisitionIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OutputServicesGroupIncMember" xlink:label="pflt_OutputServicesGroupIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEquipmentAndSuppliesTwoMember" xlink:label="pflt_HealthcareEquipmentAndSuppliesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OwlAcquisitionLLCMember" xlink:label="pflt_OwlAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareProvidersAndServicesMember" xlink:label="pflt_HealthcareProvidersAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AutoComponentsMember" xlink:label="pflt_AutoComponentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OxTwoLLCMember" xlink:label="pflt_OxTwoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PLAcquisitioncoLLCMember" xlink:label="pflt_PLAcquisitioncoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerServicesMember" xlink:label="pflt_ConsumerServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PlantHealthIntermediateIncMember" xlink:label="pflt_PlantHealthIntermediateIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerServicesOneMember" xlink:label="pflt_ConsumerServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PlayPowerIncMember" xlink:label="pflt_PlayPowerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentMember" xlink:label="pflt_CapitalEquipmentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentOneMember" xlink:label="pflt_CapitalEquipmentOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PragmaticInstituteLlcMember" xlink:label="pflt_PragmaticInstituteLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeisureProductsMember" xlink:label="pflt_LeisureProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeisureProductsOneMember" xlink:label="pflt_LeisureProductsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuanticElectronicsLLCMember" xlink:label="pflt_QuanticElectronicsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyMember" xlink:label="pflt_HealthcareTechnologyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuestexLLCMember" xlink:label="pflt_QuestexLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyOneMember" xlink:label="pflt_HealthcareTechnologyOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RanchoHealthMSOIncMember" xlink:label="pflt_RanchoHealthMSOIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyTwoMember" xlink:label="pflt_HealthcareTechnologyTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RecteqLLCMember" xlink:label="pflt_RecteqLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentTwoMember" xlink:label="pflt_CapitalEquipmentTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ResearchNowGroupIncAndDynataLLCMember" xlink:label="pflt_ResearchNowGroupIncAndDynataLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentThreeMember" xlink:label="pflt_CapitalEquipmentThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiverpointMedicalLLCMember" xlink:label="pflt_RiverpointMedicalLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RiversideAssessmentsLLCMember" xlink:label="pflt_RiversideAssessmentsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsThreeMember" xlink:label="pflt_DistributorsThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SalesBenchmarkIndexLLCMember" xlink:label="pflt_SalesBenchmarkIndexLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AirFreightAndLogisticsMember" xlink:label="pflt_AirFreightAndLogisticsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerFinanceMember" xlink:label="pflt_ConsumerFinanceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SargentAndGreenleafIncMember" xlink:label="pflt_SargentAndGreenleafIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerFinanceOneMember" xlink:label="pflt_ConsumerFinanceOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SchlesingerGlobalIncMember" xlink:label="pflt_SchlesingerGlobalIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndBuildingMember" xlink:label="pflt_ConstructionAndBuildingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeawayBuyerLlcMember" xlink:label="pflt_SeawayBuyerLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndBuildingOneMember" xlink:label="pflt_ConstructionAndBuildingOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SigmaDefenseSystemsLLCMember" xlink:label="pflt_SigmaDefenseSystemsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SignatureSystemsHoldingCompanyMember" xlink:label="pflt_SignatureSystemsHoldingCompanyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndBuildingTwoMember" xlink:label="pflt_ConstructionAndBuildingTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SmileBrandsIncMember" xlink:label="pflt_SmileBrandsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TextilesApparelAndLuxuryGoodsOneMember" xlink:label="pflt_TextilesApparelAndLuxuryGoodsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SmileBrandsIncLcMember" xlink:label="pflt_SmileBrandsIncLcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsTwoMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SolutionreachIncMember" xlink:label="pflt_SolutionreachIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsThreeMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SpearEducationLLCMember" xlink:label="pflt_SpearEducationLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionOneMember" xlink:label="pflt_MediaDiversifiedAndProductionOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeisureProductsTwoMember" xlink:label="pflt_LeisureProductsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SpendmendHoldingsLLCMember" xlink:label="pflt_SpendmendHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareAndPharmaceuticalsMember" xlink:label="pflt_HealthcareAndPharmaceuticalsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_STVGroupIncorporatedMember" xlink:label="pflt_STVGroupIncorporatedMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareAndPharmaceuticalsOneMember" xlink:label="pflt_HealthcareAndPharmaceuticalsOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember" xlink:label="pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareAndPharmaceuticalsTwoMember" xlink:label="pflt_HealthcareAndPharmaceuticalsTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TACLifePortPurchaserLLCMember" xlink:label="pflt_TACLifePortPurchaserLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyThreeMember" xlink:label="pflt_HealthcareTechnologyThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TacLifeportHoldingsLlcMember" xlink:label="pflt_TacLifeportHoldingsLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringMember" xlink:label="pflt_ConstructionAndEngineeringMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TeleGuamHoldingsLLCMember" xlink:label="pflt_TeleGuamHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WirelessTelecommunicationServicesMember" xlink:label="pflt_WirelessTelecommunicationServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TeneoHoldingsLLCMember" xlink:label="pflt_TeneoHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaBroadcastingAndSubscriptionMember" xlink:label="pflt_MediaBroadcastingAndSubscriptionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheAegisTechnologiesGroupLLCMember" xlink:label="pflt_TheAegisTechnologiesGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringOneMember" xlink:label="pflt_ConstructionAndEngineeringOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheBluebirdGroupLLCMember" xlink:label="pflt_TheBluebirdGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringTwoMember" xlink:label="pflt_ConstructionAndEngineeringTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheInfosoftGroupLLCMember" xlink:label="pflt_TheInfosoftGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringThreeMember" xlink:label="pflt_ConstructionAndEngineeringThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheVertexCompaniesLLCMember" xlink:label="pflt_TheVertexCompaniesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FoodProductsMember" xlink:label="pflt_FoodProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TPCCanadaParentIncAndTPCUSParentLLCMember" xlink:label="pflt_TPCCanadaParentIncAndTPCUSParentLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WholesaleMember" xlink:label="pflt_WholesaleMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TVCEnterprisesLLCMember" xlink:label="pflt_TVCEnterprisesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AutomobilesOneMember" xlink:label="pflt_AutomobilesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TWSAcquisitionCorporationMember" xlink:label="pflt_TWSAcquisitionCorporationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaAdvertisingPrintingAndPublishingMember" xlink:label="pflt_MediaAdvertisingPrintingAndPublishingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TytoAtheneLLCMember" xlink:label="pflt_TytoAtheneLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerGoodsDurableMember" xlink:label="pflt_ConsumerGoodsDurableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UBEOLLCMember" xlink:label="pflt_UBEOLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UniqueIndoorComfortLLCMember" xlink:label="pflt_UniqueIndoorComfortLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AutomobilesIndustryMember" xlink:label="pflt_AutomobilesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WalkerEdisonFurnitureCompanyLLCMember" xlink:label="pflt_WalkerEdisonFurnitureCompanyLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialServicesSectorMember" xlink:label="us-gaap_FinancialServicesSectorMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WildcatBuyercoIncMember" xlink:label="pflt_WildcatBuyercoIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareProvidersAndServicesOneMember" xlink:label="pflt_HealthcareProvidersAndServicesOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ZipsCarWashLLCMember" xlink:label="pflt_ZipsCarWashLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FinancialServicesMember" xlink:label="pflt_FinancialServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MailsouthIncMember" xlink:label="pflt_MailsouthIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BeverageFoodAndTobaccoMember" xlink:label="pflt_BeverageFoodAndTobaccoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuantiTechLLCMember" xlink:label="pflt_QuantiTechLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BeverageFoodAndTobaccoOneMember" xlink:label="pflt_BeverageFoodAndTobaccoOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdNetHoldingsIncMember" xlink:label="pflt_AdNetHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommodityChemicalsMember" xlink:label="pflt_CommodityChemicalsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImagineTopcoLPMember" xlink:label="pflt_ImagineTopcoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarsIntermediateHoldingsIIIncMember" xlink:label="pflt_MarsIntermediateHoldingsIIIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeritDirectHoldingsLPMember" xlink:label="pflt_MeritDirectHoldingsLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NXOFHoldingsIncMember" xlink:label="pflt_NXOFHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ORLHoldcoIncMember" xlink:label="pflt_ORLHoldcoIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SignatureCRIntermediateHoldcoIncMember" xlink:label="pflt_SignatureCRIntermediateHoldcoIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TPCHoldingCompanyLPMember" xlink:label="pflt_TPCHoldingCompanyLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TWDParentHoldingsLLCMember" xlink:label="pflt_TWDParentHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UniTekGlobalServicesIncMember" xlink:label="pflt_UniTekGlobalServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AffinionGroupHoldingsIncMember" xlink:label="pflt_AffinionGroupHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AGInvestcoLPMember" xlink:label="pflt_AGInvestcoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AltamiraIntermediateCompanyIIIncMember" xlink:label="pflt_AltamiraIntermediateCompanyIIIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AthleticoHoldingsLLCMember" xlink:label="pflt_AthleticoHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ByLightInvestcoLPMember" xlink:label="pflt_ByLightInvestcoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CartessaAestheticsLLCMember" xlink:label="pflt_CartessaAestheticsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CIAlliedInvestmentHoldingsLLCMember" xlink:label="pflt_CIAlliedInvestmentHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConnatixParentLLCMember" xlink:label="pflt_ConnatixParentLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_Crane1AcquisitionParentHoldingsLPMember" xlink:label="pflt_Crane1AcquisitionParentHoldingsLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CrashChampionsHoldingsLLCMember" xlink:label="pflt_CrashChampionsHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DeltaInvestCoLPMember" xlink:label="pflt_DeltaInvestCoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECMInvestorsLLCMember" xlink:label="pflt_ECMInvestorsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECommissionHoldingCorporationMember" xlink:label="pflt_ECommissionHoldingCorporationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ExigoLLCMember" xlink:label="pflt_ExigoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ExpressWashTopcoLlcMember" xlink:label="pflt_ExpressWashTopcoLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FedHCInvestCoLPMember" xlink:label="pflt_FedHCInvestCoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GaugeInfosoftCoInvestLLCMember" xlink:label="pflt_GaugeInfosoftCoInvestLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GaugeLashCoinvestLLCMember" xlink:label="pflt_GaugeLashCoinvestLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GaugeSchlesingerCoinvestLLCMember" xlink:label="pflt_GaugeSchlesingerCoinvestLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GaugeTVCCoinvestLLCMember" xlink:label="pflt_GaugeTVCCoinvestLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GCOMInvestCoLPMember" xlink:label="pflt_GCOMInvestCoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GoDawgsCapitalIIILPMember" xlink:label="pflt_GoDawgsCapitalIIILPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HancockClaimsConsultantsInvestorsLLCMember" xlink:label="pflt_HancockClaimsConsultantsInvestorsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HVWattersonHoldingsLLCMember" xlink:label="pflt_HVWattersonHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IconPartnersVCLPMember" xlink:label="pflt_IconPartnersVCLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IINGroupHoldingsLLCMember" xlink:label="pflt_IINGroupHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IroncladHoldcoLLCMember" xlink:label="pflt_IroncladHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITCInfusionCoInvestLPMember" xlink:label="pflt_ITCInfusionCoInvestLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITCRumbaLLCMember" xlink:label="pflt_ITCRumbaLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_JwcUmaHoldingsLpUrologyManagementAssociatesLlcMember" xlink:label="pflt_JwcUmaHoldingsLpUrologyManagementAssociatesLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_JWCWEHoldingsLPMember" xlink:label="pflt_JWCWEHoldingsLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_KLStocktonCoInvestLPMember" xlink:label="pflt_KLStocktonCoInvestLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_KentuckyRacingHoldcoLLCMember" xlink:label="pflt_KentuckyRacingHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LightspeedInvestmentHoldcoLLCMember" xlink:label="pflt_LightspeedInvestmentHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeadowlarkTitleLLCMember" xlink:label="pflt_MeadowlarkTitleLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MSparkLLCMember" xlink:label="pflt_MSparkLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NEPRTParentHoldingsLLCMember" xlink:label="pflt_NEPRTParentHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NorthHavenSaintsEquityHoldingsLPMember" xlink:label="pflt_NorthHavenSaintsEquityHoldingsLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OceanSoundDiscoveryEquityLPMember" xlink:label="pflt_OceanSoundDiscoveryEquityLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OHCPVBCCOILPMember" xlink:label="pflt_OHCPVBCCOILPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OralSurgeryITCHoldingsLLCMember" xlink:label="pflt_OralSurgeryITCHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkTSOSeniorLoanFundLPMember" xlink:label="pflt_PennantParkTSOSeniorLoanFundLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PinkLilyHoldcoLLCMember" xlink:label="pflt_PinkLilyHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuantiTechInvestCoLPMember" xlink:label="pflt_QuantiTechInvestCoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuantiTechInvestCoIILPMember" xlink:label="pflt_QuantiTechInvestCoIILPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RFMGParentLPMember" xlink:label="pflt_RFMGParentLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SBIHoldingsInvestmentsLLCMember" xlink:label="pflt_SBIHoldingsInvestmentsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeawayTopcoLPMember" xlink:label="pflt_SeawayTopcoLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SPL2HoldingsLLCMember" xlink:label="pflt_SPL2HoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SSCDominionHoldingsLLCMember" xlink:label="pflt_SSCDominionHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_StellPenHoldingsLLCMember" xlink:label="pflt_StellPenHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TowerArchInfolinksMediaLPMember" xlink:label="pflt_TowerArchInfolinksMediaLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UniVistaInsuranceMember" xlink:label="pflt_UniVistaInsuranceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WCPIvyRehabQPCFFeederLPMember" xlink:label="pflt_WCPIvyRehabQPCFFeederLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WildcatParentLPMember" xlink:label="pflt_WildcatParentLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DbiHoldingsLlcMember" xlink:label="pflt_DbiHoldingsLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarketplaceEventsLLCMember" xlink:label="pflt_MarketplaceEventsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredMember" xlink:label="pflt_PennantParkSeniorSecuredMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NewMPEHoldingsLLCMember" xlink:label="pflt_NewMPEHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BlackRockFederalFDInstitutional30Member" xlink:label="pflt_BlackRockFederalFDInstitutional30Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BNYMellonCashMember" xlink:label="pflt_BNYMellonCashMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EighteenFreemontStreetAcquisitionLLCMember" xlink:label="pflt_EighteenFreemontStreetAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConfluentHealthLLCMember" xlink:label="pflt_ConfluentHealthLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CoolSysIncMember" xlink:label="pflt_CoolSysIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DigitalRoomHoldingsIncMember" xlink:label="pflt_DigitalRoomHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EastValleyTouristDevelopmentAuthorityMember" xlink:label="pflt_EastValleyTouristDevelopmentAuthorityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IMIAHoldingsIncMember" xlink:label="pflt_IMIAHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InnovaMedicalOphthalmicsIncMember" xlink:label="pflt_InnovaMedicalOphthalmicsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LombartBrothersIncMember" xlink:label="pflt_LombartBrothersIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MagentaBuyerLLCMember" xlink:label="pflt_MagentaBuyerLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ResearchHorizonsLLCMember" xlink:label="pflt_ResearchHorizonsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SnakClubLLCMember" xlink:label="pflt_SnakClubLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UrologyManagementAssociatesLLCMember" xlink:label="pflt_UrologyManagementAssociatesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_VisionPurchaserCorporationMember" xlink:label="pflt_VisionPurchaserCorporationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PTNetworkIntermediateHoldingsLLCMember" xlink:label="pflt_PTNetworkIntermediateHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CIPTNInvestmentHoldingsIILLCMember" xlink:label="pflt_CIPTNInvestmentHoldingsIILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DBIIntermediateHoldcoLLCMember" xlink:label="pflt_DBIIntermediateHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImiaHoldingsIncRevolverMember" xlink:label="pflt_ImiaHoldingsIncRevolverMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InnovaMedicalOphthalmicsIncRevolverMember" xlink:label="pflt_InnovaMedicalOphthalmicsIncRevolverMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IntegrativeNutritionLlcRevolverMember" xlink:label="pflt_IntegrativeNutritionLlcRevolverMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_K2PureSolutionsNocalLPRevolverMember" xlink:label="pflt_K2PureSolutionsNocalLPRevolverMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SpectacleGaryHoldingsLLCMember" xlink:label="pflt_SpectacleGaryHoldingsLLCMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="srt_EquityMethodInvesteeNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="srt_EquityMethodInvesteeNameDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AdNetAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="us-gaap_RevolvingCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_EquitySecuritiesByIndustryAxis" xlink:to="us-gaap_EquitySecuritiesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_EquitySecuritiesByIndustryAxis" xlink:to="us-gaap_EquitySecuritiesIndustryMember_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_PreferredStockMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:to="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" xlink:to="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain" xlink:to="us-gaap_UnfundedLoanCommitmentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SuperSeniorPreferredEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentMaturityDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AltamiraTechnologiesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_SecondLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="pflt_CommonEquityWarrantsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeniorPreferredEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_IndustryName" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesExcludingCashAndCashEquivalentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="pflt_CommonEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AmericanInsulatedGlassLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanBMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_EquityInterestsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassAMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentInterestRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentExcludingCashAndCashEquivalentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ITServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AmericanTeleconferencingServicesLtdMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtFortyThreePointSevenPercentageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentPaymentInKindInterestRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ITServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AmsiveHoldingCorporationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_EquitySecuritiesByIndustryAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_CashAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SuperPriorityFirstLienTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_EquityInterestsTwelvePointOnePercentageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateTerms" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_DebtInstrumentInterestParAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ITServicesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AnteriadLlcFKAMeritDirectLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SuperPriorityFirstLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BuildingProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesAOnePreferredEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_OnePointFiveLienTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AnteriadHoldingsLpFKAMeritdirectHoldingsLpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedBalanceShares" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TelecommunicationsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_UnfundedTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesAAPreferredEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AnyHourServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_StatementClassOfStockAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentOwnedBalanceParValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TelecommunicationsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesBCommonEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ApexServicePartnersLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TelecommunicationsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ApiTechnologiesCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnergyEquipmentAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_APIHoldingIIICorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_LiabilitiesInExcessOfOtherAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnergyEquipmentAndServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AppliedTechnicalServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_AssetsNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnergyEquipmentAndServicesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ArcfieldAcquisitionCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BetaPlusTechnologiesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BlackhawkIndustrialDistributionIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BroderBrosCoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BurgessPointHoldingsLpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesFourMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ByLightProfessionalITServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesFiveMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CadenceAerospaceLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CanoHealthLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CF512IncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CHAHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ChallengerPerformanceOptimizationIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CompexLegalServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ConnatixBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AerospaceAndDefenseMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_Crane1ServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InternetSoftwareAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InternetSoftwareAndServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CrashChampionsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DouglasProductsAndPackagingCompanyLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DouglasSewerIntermediateLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DrSquatchLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DRSHoldingsIIIIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TextilesApparelAndLuxuryGoodsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DuracoSpecialtyTapesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HighTechIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECLEntertainmentLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HighTechIndustriesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECMIndustriesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HighTechIndustriesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AerospaceAndDefenseOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECommissionFinancialServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_EfficientCollaborativeRetailMarketingCompanyLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnvironmentalIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ExigoIntermediateIILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BusinessServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_FindexGroupLimitedMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BusinessServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GantechAcquisitionCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ProfessionalServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GlobalHoldingsInterCoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ProfessionalServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GraffitiBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HancockRoofingAndConstructionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ProfessionalServicesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HoldcoSandsIntermediateLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthProvidersAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HWHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_AutomobilesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="44" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IDCInfusionServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="44" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ChemicalsPlasticsAndRubberMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="45" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IGInvestmentsHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="45" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ChemicalsPlasticsAndRubberOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="46" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ImagineAcquisitioncoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="46" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ChemicalsPlasticsAndRubberTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="47" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InceptionFertilityVenturesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="47" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_PersonalProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="48" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InfolinksMediaBuycoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="48" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_PersonalProductsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="49" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IntegrativeNutritionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="49" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_PersonalProductsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="50" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IntegrityMarketingAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="50" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelGamingAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="51" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ITIHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="51" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ContainersAndPackagingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="52" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_K2PureSolutionsNoCalLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="52" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelsRestaurantsAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="53" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_KineticPurchaserLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="53" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="54" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LashOpCoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="54" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BankingFinanceInsuranceAndRealEstateMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="55" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LAVGearHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="55" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BankingFinanceInsuranceAndRealEstateOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="56" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LedgeLoungerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="56" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BankingFinanceInsuranceAndRealEstateTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="57" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LightspeedBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="57" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="58" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LuckyBucksLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="58" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="59" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_SoftwareMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="59" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MAGDSCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="60" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_SoftwareOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="60" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarsAcquisitionHoldingsCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="61" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_SoftwareTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="61" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PRAEventsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="62" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedFinancialServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="62" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MBSHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="63" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TradingCompaniesAndDistributorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="63" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MdiBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="64" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MdiAggregatorLpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="64" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TradingCompaniesAndDistributorsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="65" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeadowlarkAcquirerLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="65" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TradingCompaniesAndDistributorsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="66" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeritDirectLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="66" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="67" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="67" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MissionCriticalElectronicsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="68" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MunicipalEmergencyServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="68" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="69" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NBHGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="69" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="70" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OISManagementServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="71" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEquipmentAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="71" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OneStopMailingLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="72" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEquipmentAndSuppliesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="72" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ORLAcquisitionIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="73" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OutputServicesGroupIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="73" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEquipmentAndSuppliesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="74" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OwlAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="74" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareProvidersAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="75" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AutoComponentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="75" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OxTwoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="76" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PLAcquisitioncoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="76" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="77" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PlantHealthIntermediateIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="77" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="78" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PlayPowerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="78" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="79" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="80" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PragmaticInstituteLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="80" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_LeisureProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="81" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_LeisureProductsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="81" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuanticElectronicsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="82" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="82" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuestexLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="83" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="83" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RanchoHealthMSOIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="84" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="84" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RecteqLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="85" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="85" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ResearchNowGroupIncAndDynataLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="86" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="86" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RiverpointMedicalLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="87" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RiversideAssessmentsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="87" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="88" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SalesBenchmarkIndexLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="88" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AirFreightAndLogisticsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="89" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerFinanceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="89" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SargentAndGreenleafIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="90" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerFinanceOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="90" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SchlesingerGlobalIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="91" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndBuildingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="91" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SeawayBuyerLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="92" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndBuildingOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="92" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SigmaDefenseSystemsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="93" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SignatureSystemsHoldingCompanyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="93" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndBuildingTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="94" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SmileBrandsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="94" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TextilesApparelAndLuxuryGoodsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="95" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SmileBrandsIncLcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="95" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="96" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SolutionreachIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="96" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="97" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SpearEducationLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="97" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="98" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_LeisureProductsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="98" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SpendmendHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="99" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareAndPharmaceuticalsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="99" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_STVGroupIncorporatedMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="100" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareAndPharmaceuticalsOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="100" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="101" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareAndPharmaceuticalsTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="101" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TACLifePortPurchaserLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="102" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="102" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TacLifeportHoldingsLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="103" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="103" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TeleGuamHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="104" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_WirelessTelecommunicationServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="104" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TeneoHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="105" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaBroadcastingAndSubscriptionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="105" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheAegisTechnologiesGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="106" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="106" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheBluebirdGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="107" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="107" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheInfosoftGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="108" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="108" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheVertexCompaniesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="109" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_FoodProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="109" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TPCCanadaParentIncAndTPCUSParentLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="110" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_WholesaleMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="110" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TVCEnterprisesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="111" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AutomobilesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="111" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TWSAcquisitionCorporationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="112" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaAdvertisingPrintingAndPublishingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="112" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TytoAtheneLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="113" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerGoodsDurableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="113" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UBEOLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="114" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UniqueIndoorComfortLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="114" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AutomobilesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="115" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WalkerEdisonFurnitureCompanyLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="115" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_FinancialServicesSectorMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="116" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WildcatBuyercoIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="116" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareProvidersAndServicesOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="117" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ZipsCarWashLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="117" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_FinancialServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="118" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MailsouthIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="118" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BeverageFoodAndTobaccoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="119" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuantiTechLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="119" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BeverageFoodAndTobaccoOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="120" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AdNetHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="120" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommodityChemicalsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="121" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ImagineTopcoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="122" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarsIntermediateHoldingsIIIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="123" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeritDirectHoldingsLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="124" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NXOFHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="125" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ORLHoldcoIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="126" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SignatureCRIntermediateHoldcoIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="127" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TPCHoldingCompanyLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="128" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TWDParentHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="129" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UniTekGlobalServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="130" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AffinionGroupHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="131" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AGInvestcoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="132" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AltamiraIntermediateCompanyIIIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="133" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AthleticoHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="134" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ByLightInvestcoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="135" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CartessaAestheticsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="136" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CIAlliedInvestmentHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="137" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ConnatixParentLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="138" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_Crane1AcquisitionParentHoldingsLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="139" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CrashChampionsHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="140" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DeltaInvestCoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="141" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECMInvestorsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="142" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECommissionHoldingCorporationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="143" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ExigoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="144" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ExpressWashTopcoLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="145" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_FedHCInvestCoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="146" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GaugeInfosoftCoInvestLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="147" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GaugeLashCoinvestLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="148" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GaugeSchlesingerCoinvestLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="149" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GaugeTVCCoinvestLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="150" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GCOMInvestCoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="151" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GoDawgsCapitalIIILPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="152" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HancockClaimsConsultantsInvestorsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="153" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HVWattersonHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="154" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IconPartnersVCLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="155" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IINGroupHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="156" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IroncladHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="157" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ITCInfusionCoInvestLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="158" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ITCRumbaLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="159" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_JwcUmaHoldingsLpUrologyManagementAssociatesLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="160" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_JWCWEHoldingsLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="161" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_KLStocktonCoInvestLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="162" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_KentuckyRacingHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="163" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LightspeedInvestmentHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="164" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeadowlarkTitleLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="165" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MSparkLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="166" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NEPRTParentHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="167" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NorthHavenSaintsEquityHoldingsLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="168" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OceanSoundDiscoveryEquityLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="169" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OHCPVBCCOILPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="170" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OralSurgeryITCHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="171" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PennantParkTSOSeniorLoanFundLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="172" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PinkLilyHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="173" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuantiTechInvestCoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="174" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuantiTechInvestCoIILPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="175" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RFMGParentLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="176" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SBIHoldingsInvestmentsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="177" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SeawayTopcoLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="178" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SPL2HoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="179" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SSCDominionHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="180" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_StellPenHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="181" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TowerArchInfolinksMediaLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="182" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UniVistaInsuranceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="183" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WCPIvyRehabQPCFFeederLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="184" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WildcatParentLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="185" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DbiHoldingsLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="186" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarketplaceEventsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="187" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PennantParkSeniorSecuredMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="188" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NewMPEHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="189" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="190" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BlackRockFederalFDInstitutional30Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="191" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BNYMellonCashMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="192" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_EighteenFreemontStreetAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="194" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ConfluentHealthLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="195" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CoolSysIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="196" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DigitalRoomHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="197" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_EastValleyTouristDevelopmentAuthorityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="198" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IMIAHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="199" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InnovaMedicalOphthalmicsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="200" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LombartBrothersIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="201" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MagentaBuyerLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="202" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ResearchHorizonsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="203" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SnakClubLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="204" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UrologyManagementAssociatesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="205" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_VisionPurchaserCorporationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="206" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PTNetworkIntermediateHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="207" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CIPTNInvestmentHoldingsIILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="208" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DBIIntermediateHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="209" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ImiaHoldingsIncRevolverMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="210" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InnovaMedicalOphthalmicsIncRevolverMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="211" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IntegrativeNutritionLlcRevolverMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="212" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_K2PureSolutionsNocalLPRevolverMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="213" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SpectacleGaryHoldingsLLCMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_StatementConsolidatedScheduleOfInvestmentsParenthetical">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtMember" xlink:label="pflt_FirstLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="us-gaap_StatementEquityComponentsAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain" xlink:label="us-gaap_EquityComponentDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockMember" xlink:label="us-gaap_PreferredStockMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfVotingSecuritiesOwned" xlink:label="pflt_PercentageOfVotingSecuritiesOwned"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSecuredDebtMember" xlink:label="pflt_SecondLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommonEquityWarrantsMember" xlink:label="pflt_CommonEquityWarrantsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfQualifyingAssetsToTotalAssets" xlink:label="pflt_PercentageOfQualifyingAssetsToTotalAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommonEquityMember" xlink:label="pflt_CommonEquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityInterestsMember" xlink:label="pflt_EquityInterestsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfNonQualifyingAssetsToTotalAssets" xlink:label="pflt_PercentageOfNonQualifyingAssetsToTotalAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentExcludingCashAndCashEquivalentMember" xlink:label="pflt_InvestmentExcludingCashAndCashEquivalentMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AcceleratedShareRepurchasesCashOrStockSettlement" xlink:label="us-gaap_AcceleratedShareRepurchasesCashOrStockSettlement"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsAndCashEquivalentsMember" xlink:label="pflt_InvestmentsAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LiabilitiesInExcessOfOtherAssetsMember" xlink:label="pflt_LiabilitiesInExcessOfOtherAssetsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetAssetsMember" xlink:label="pflt_NetAssetsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonControlledPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonControlledPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInControlledPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInControlledPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInNonAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInNonAffiliatedPortfolioCompaniesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsInAffiliatedPortfolioCompaniesMember" xlink:label="pflt_InvestmentsInAffiliatedPortfolioCompaniesMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonControlledNonAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_PreferredStockMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_PercentageOfVotingSecuritiesOwned" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonControlledAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_SecondLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="pflt_CommonEquityWarrantsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_PercentageOfQualifyingAssetsToTotalAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="pflt_CommonEquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInControlledAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_EquityInterestsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_PercentageOfNonQualifyingAssetsToTotalAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentExcludingCashAndCashEquivalentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_AcceleratedShareRepurchasesCashOrStockSettlement" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_CashAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_LiabilitiesInExcessOfOtherAssetsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_NetAssetsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonControlledPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInControlledPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInNonAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsInAffiliatedPortfolioCompaniesMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureOrganizationAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember" xlink:label="srt_ScenarioForecastMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndThirtyOneAssetBackedDebtMember" xlink:label="pflt_TwoThousandAndThirtyOneAssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassDSecuredDeferrableFloatingRateNotesMember" xlink:label="pflt_ClassDSecuredDeferrableFloatingRateNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FloatingRateLoansMember" xlink:label="pflt_FloatingRateLoansMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LienCategoryAxis" xlink:label="us-gaap_LienCategoryAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LienCategoryDomain" xlink:label="us-gaap_LienCategoryDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LienCategoryDomain" xlink:label="us-gaap_LienCategoryDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtMember" xlink:label="pflt_FirstLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis" xlink:label="us-gaap_VariableRateAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain" xlink:label="us-gaap_VariableRateDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain" xlink:label="us-gaap_VariableRateDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentySixNotesPayableMember" xlink:label="pflt_TwoThousandTwentySixNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:label="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain" xlink:label="us-gaap_DistributionTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain" xlink:label="us-gaap_DistributionTypeDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityDistributionAgreementsMember" xlink:label="pflt_EquityDistributionAgreementsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AtTheMarketOfferingMember" xlink:label="pflt_AtTheMarketOfferingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfManagedAssetsInvested" xlink:label="pflt_PercentageOfManagedAssetsInvested"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesMember" xlink:label="pflt_TwoThousandTwentyThreeNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkTSOSeniorLoanFundLPMember" xlink:label="pflt_PennantParkTSOSeniorLoanFundLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSecuredDebtMember" xlink:label="pflt_SecondLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfOverallPortfolio" xlink:label="pflt_PercentageOfOverallPortfolio"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityBasisPoints" xlink:label="pflt_CreditFacilityBasisPoints"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AggregatePrincipalAmountOfNotesIssued" xlink:label="pflt_AggregatePrincipalAmountOfNotesIssued"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" xlink:label="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SaleOfInvestmentsToWhollyOwnedSubsidiary" xlink:label="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiary"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInCash" xlink:label="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInCash"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInEquityInterest" xlink:label="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInEquityInterest"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfOutstandingClassAUnits" xlink:label="pflt_PercentageOfOutstandingClassAUnits"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="us-gaap_RealizedInvestmentGainsLosses"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalCommitment" xlink:label="pflt_CapitalCommitment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_VotingInterestInGeneralPartnership" xlink:label="pflt_VotingInterestInGeneralPartnership"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AggregateOfferingPrice" xlink:label="pflt_AggregateOfferingPrice"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfOriginalPrincipalAmountPayable" xlink:label="pflt_PercentageOfOriginalPrincipalAmountPayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfPreferredSharesOfSecuritizationIssuer" xlink:label="pflt_PercentageOfPreferredSharesOfSecuritizationIssuer"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfNotesIssuedBySecuritizationIssuer" xlink:label="pflt_PercentageOfNotesIssuedBySecuritizationIssuer"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WeightedAveragePricePerShareOfCommonStockIssued" xlink:label="pflt_WeightedAveragePricePerShareOfCommonStockIssued"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProceedsFromIssuanceOfCommonStockGross" xlink:label="pflt_ProceedsFromIssuanceOfCommonStockGross"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LegalAndOtherOfferingCosts" xlink:label="pflt_LegalAndOtherOfferingCosts"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ScenarioUnspecifiedDomain" xlink:to="srt_ScenarioForecastMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_TwoThousandAndThirtyOneAssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassDSecuredDeferrableFloatingRateNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FloatingRateLoansMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LienCategoryAxis" xlink:to="us-gaap_LienCategoryDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LienCategoryAxis" xlink:to="us-gaap_LienCategoryDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LienCategoryDomain" xlink:to="pflt_FirstLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_VariableRateAxis" xlink:to="us-gaap_VariableRateDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_VariableRateAxis" xlink:to="us-gaap_VariableRateDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_VariableRateDomain" xlink:to="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TwoThousandTwentySixNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:to="us-gaap_DistributionTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" xlink:to="us-gaap_DistributionTypeDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DistributionTypeDomain" xlink:to="pflt_EquityDistributionAgreementsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsidiarySaleOfStockAxis" xlink:to="us-gaap_SaleOfStockNameOfTransactionDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SaleOfStockNameOfTransactionDomain" xlink:to="pflt_AtTheMarketOfferingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfManagedAssetsInvested" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_TwoThousandTwentyThreeNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_PennantParkTSOSeniorLoanFundLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LienCategoryAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LienCategoryDomain" xlink:to="pflt_SecondLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfOverallPortfolio" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_CreditFacilityBasisPoints" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_VariableRateAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_NotesPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_AggregatePrincipalAmountOfNotesIssued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="srt_StatementScenarioAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateStatedPercentage" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateDuringPeriod" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_SubsidiarySaleOfStockAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiary" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInCash" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_SaleOfInvestmentsToWhollyOwnedSubsidiaryInEquityInterest" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfOutstandingClassAUnits" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_RealizedInvestmentGainsLosses" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_CapitalCommitment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_VotingInterestInGeneralPartnership" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_AggregateOfferingPrice" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesNewIssues" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfOriginalPrincipalAmountPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfPreferredSharesOfSecuritizationIssuer" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfNotesIssuedBySecuritizationIssuer" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_WeightedAveragePricePerShareOfCommonStockIssued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_ProceedsFromIssuanceOfCommonStockGross" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueNewIssues" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_LegalAndOtherOfferingCosts" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SignificantAccountingPoliciesLineItems" xlink:label="pflt_SignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SignificantAccountingPoliciesTable" xlink:label="pflt_SignificantAccountingPoliciesTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:label="us-gaap_FinancingReceivablesPeriodPastDueDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember" xlink:label="us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableNonaccrualPercentPastDue1" xlink:label="us-gaap_FinancingReceivableNonaccrualPercentPastDue1"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualPercentPastDue" xlink:label="us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualPercentPastDue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NumberOfPortfolioOnNonaccrual" xlink:label="pflt_NumberOfPortfolioOnNonaccrual"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProvisionForTaxesOnNetInvestmentIncome" xlink:label="pflt_ProvisionForTaxesOnNetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProvisionForTaxesOnNetUnrealizedGainOnInvestments" xlink:label="pflt_ProvisionForTaxesOnNetUnrealizedGainOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProvisionForTaxesOnNetRealizedGainOnInvestments" xlink:label="pflt_ProvisionForTaxesOnNetRealizedGainOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PrepaidTaxAsset" xlink:label="pflt_PrepaidTaxAsset"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" xlink:label="us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_SignificantAccountingPoliciesTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="pflt_SignificantAccountingPoliciesTable" xlink:to="us-gaap_FinancingReceivablesPeriodPastDueAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:to="us-gaap_FinancingReceivablesPeriodPastDueDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FinancingReceivablesPeriodPastDueAxis" xlink:to="us-gaap_FinancingReceivablesPeriodPastDueDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FinancingReceivablesPeriodPastDueDomain" xlink:to="us-gaap_FinancingReceivables30To59DaysPastDueMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_FinancingReceivableNonaccrualPercentPastDue1" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrualPercentPastDue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_NumberOfPortfolioOnNonaccrual" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_ProvisionForTaxesOnNetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_ProvisionForTaxesOnNetUnrealizedGainOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_DeferredTaxLiabilities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_ProvisionForTaxesOnNetRealizedGainOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="pflt_PrepaidTaxAsset" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_SignificantAccountingPoliciesLineItems" xlink:to="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureAgreementsAndRelatedPartyTransactionsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems" xlink:label="us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:label="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="us-gaap_TypeOfArrangementAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="us-gaap_ArrangementsAndNonarrangementTransactionsMember_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeePaymentConditionOneMember" xlink:label="pflt_IncentiveFeePaymentConditionOneMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdministratorMember" xlink:label="pflt_AdministratorMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OtherRelatedPartyMember" xlink:label="pflt_OtherRelatedPartyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnnualRateOfBaseManagementFee" xlink:label="pflt_AnnualRateOfBaseManagementFee"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeePaymentConditionTwoMember" xlink:label="pflt_IncentiveFeePaymentConditionTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BaseManagementFee" xlink:label="pflt_BaseManagementFee"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeePaymentConditionThreeMember" xlink:label="pflt_IncentiveFeePaymentConditionThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkTSOSeniorLoanFundLPMember" xlink:label="pflt_PennantParkTSOSeniorLoanFundLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BaseManagementFeeAmendmentDescription" xlink:label="pflt_BaseManagementFeeAmendmentDescription"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeeQuarterHurdleRate" xlink:label="pflt_IncentiveFeeQuarterHurdleRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeeAnnualHurdleRate" xlink:label="pflt_IncentiveFeeAnnualHurdleRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeesOnNetInvestmentIncome" xlink:label="pflt_IncentiveFeesOnNetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PreIncentiveFeeNetInvestmentIncomePercentage" xlink:label="pflt_PreIncentiveFeeNetInvestmentIncomePercentage"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DescriptionOfIncentiveFeeOnNetInvestmentIncome" xlink:label="pflt_DescriptionOfIncentiveFeeOnNetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeesOnNetInvestmentIncomeWaiverAmount" xlink:label="pflt_IncentiveFeesOnNetInvestmentIncomeWaiverAmount"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeeOnCapitalGainsPercentage" xlink:label="pflt_IncentiveFeeOnCapitalGainsPercentage"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeeOnCapitalGainsAccrued" xlink:label="pflt_IncentiveFeeOnCapitalGainsAccrued"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IncentiveFeeOnUnrealizedAndRealizedCapitalGainsAccrued" xlink:label="pflt_IncentiveFeeOnUnrealizedAndRealizedCapitalGainsAccrued"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeNet" xlink:label="us-gaap_InvestmentIncomeNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainOnSaleOfInvestments" xlink:label="us-gaap_GainOnSaleOfInvestments"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="us-gaap_TypeOfArrangementAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_TypeOfArrangementAxis" xlink:to="us-gaap_ArrangementsAndNonarrangementTransactionsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_TypeOfArrangementAxis" xlink:to="us-gaap_ArrangementsAndNonarrangementTransactionsMember_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:to="pflt_IncentiveFeePaymentConditionOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="pflt_AdministratorMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_OtherRelatedPartyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_AnnualRateOfBaseManagementFee" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:to="pflt_IncentiveFeePaymentConditionTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_BaseManagementFee" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:to="pflt_IncentiveFeePaymentConditionThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="srt_TitleOfIndividualAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkTSOSeniorLoanFundLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_BaseManagementFeeAmendmentDescription" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeeQuarterHurdleRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeeAnnualHurdleRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeesOnNetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_PreIncentiveFeeNetInvestmentIncomePercentage" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_DescriptionOfIncentiveFeeOnNetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeesOnNetInvestmentIncomeWaiverAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeeOnCapitalGainsPercentage" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeeOnCapitalGainsAccrued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="pflt_IncentiveFeeOnUnrealizedAndRealizedCapitalGainsAccrued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_GeneralAndAdministrativeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_InvestmentIncomeNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionLineItems" xlink:to="us-gaap_GainOnSaleOfInvestments" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain" xlink:label="us-gaap_VariableRateDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis" xlink:label="us-gaap_VariableRateAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentInSinglePortfolioCompanyMember" xlink:label="pflt_InvestmentInSinglePortfolioCompanyMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualAxis" xlink:label="srt_TitleOfIndividualAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BoardOfDirectorsAndInvestmentCommitteeMember" xlink:label="pflt_BoardOfDirectorsAndInvestmentCommitteeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="srt_ConsolidatedEntitiesAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="srt_ConsolidatedEntitiesDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="srt_ConsolidatedEntitiesDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PSSLSubsidiaryIIMember" xlink:label="pflt_PSSLSubsidiaryIIMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeniorSecuredRevolvingCreditFacilityMember" xlink:label="pflt_SeniorSecuredRevolvingCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis" xlink:label="dei_LegalEntityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain" xlink:label="dei_EntityDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkCLOIILtdMember" xlink:label="pflt_PennantParkCLOIILtdMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtMember" xlink:label="pflt_AssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="us-gaap_PaymentsToAcquireInvestments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FiveLargestInvestmentsMember" xlink:label="pflt_FiveLargestInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForProceedsFromInvestments" xlink:label="us-gaap_PaymentsForProceedsFromInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtMember" xlink:label="pflt_FirstLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueOfLargestInvestmentInSinglePortfolioCompany" xlink:label="pflt_FairValueOfLargestInvestmentInSinglePortfolioCompany"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityInterestsMember" xlink:label="pflt_EquityInterestsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueOfInvestmentInFiveLargestPortfolioCompany" xlink:label="pflt_FairValueOfInvestmentInFiveLargestPortfolioCompany"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfCapitalOwnershipInEachOfOutstandingSubordinatedNotesAndEquityInterests" xlink:label="pflt_PercentageOfCapitalOwnershipInEachOfOutstandingSubordinatedNotesAndEquityInterests"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Investments" xlink:label="us-gaap_Investments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdditionalUnfundedInvestment" xlink:label="pflt_AdditionalUnfundedInvestment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdditionalUnfundedInvestmentInEquity" xlink:label="pflt_AdditionalUnfundedInvestmentInEquity"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NumberOfMembersAppointed" xlink:label="pflt_NumberOfMembersAppointed"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuorumDescription" xlink:label="pflt_QuorumDescription"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityInterestRateDescription" xlink:label="us-gaap_LineOfCreditFacilityInterestRateDescription"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrincipalAmountOutstandingOnLoansSecuritized" xlink:label="us-gaap_PrincipalAmountOutstandingOnLoansSecuritized"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransferOfFinancialAssetsAccountedForAsSalesDescriptionOfArrangements" xlink:label="us-gaap_TransferOfFinancialAssetsAccountedForAsSalesDescriptionOfArrangements"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_VariableRateDomain" xlink:to="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_VariableRateAxis" xlink:to="us-gaap_VariableRateDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentInSinglePortfolioCompanyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="pflt_BoardOfDirectorsAndInvestmentCommitteeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ConsolidatedEntitiesAxis" xlink:to="srt_ConsolidatedEntitiesDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ConsolidatedEntitiesAxis" xlink:to="srt_ConsolidatedEntitiesDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ConsolidatedEntitiesDomain" xlink:to="pflt_PSSLSubsidiaryIIMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_SeniorSecuredRevolvingCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="pflt_PennantParkCLOIILtdMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_AssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_PaymentsToAcquireInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FiveLargestInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_PaymentsForProceedsFromInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_TitleOfIndividualAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_Assets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_ConsolidatedEntitiesAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_FairValueOfLargestInvestmentInSinglePortfolioCompany" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_EquityInterestsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_FairValueOfInvestmentInFiveLargestPortfolioCompany" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="dei_LegalEntityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_PercentageOfCapitalOwnershipInEachOfOutstandingSubordinatedNotesAndEquityInterests" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_VariableRateAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_Investments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_AdditionalUnfundedInvestment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_AdditionalUnfundedInvestmentInEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_NumberOfMembersAppointed" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_QuorumDescription" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_LineOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_LineOfCreditFacilityInterestRateDescription" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_PrincipalAmountOutstandingOnLoansSecuritized" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_TransferOfFinancialAssetsAccountedForAsSalesDescriptionOfArrangements" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsScheduleOfInvestmentsAndCashAndCashEquivalentsDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:label="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="srt_EquityMethodInvesteeNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsCostMember" xlink:label="pflt_InvestmentsCostMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienMember" xlink:label="pflt_FirstLienMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Investments" xlink:label="us-gaap_Investments"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsFairValueMember" xlink:label="pflt_InvestmentsFairValueMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienInPSSLMember" xlink:label="pflt_FirstLienInPSSLMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienMember" xlink:label="pflt_SecondLienMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsAndCash" xlink:label="us-gaap_InvestmentsAndCash"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMember" xlink:label="us-gaap_EquityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EquityInterestsInPSSLMember" xlink:label="pflt_EquityInterestsInPSSLMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:to="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="srt_EquityMethodInvesteeNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InvestmentsCostMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_Investments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InvestmentsFairValueMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienInPSSLMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_SecondLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentIncomeReportedAmountsByCategoryLineItems" xlink:to="us-gaap_InvestmentsAndCash" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_EquityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_EquityInterestsInPSSLMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsScheduleOfInvestmentsByIndustryClassificationAndEnumeratesPercentageByFairValueOfTotalPortfolioAssetsExcludingCashAndCashEquivalentsDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentHoldingsLineItems" xlink:label="us-gaap_InvestmentHoldingsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentHoldingsTable" xlink:label="us-gaap_InvestmentHoldingsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesByIndustryAxis" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="us-gaap_EquitySecuritiesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaMember" xlink:label="pflt_MediaMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueInvestmentsOfPortfolioAssetsExcludingCashAndCashEquivalentsPercentage" xlink:label="pflt_FairValueInvestmentsOfPortfolioAssetsExcludingCashAndCashEquivalentsPercentage"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProfessionalServicesMember" xlink:label="pflt_ProfessionalServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PersonalProductsMember" xlink:label="pflt_PersonalProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentMember" xlink:label="pflt_CapitalEquipmentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesMember" xlink:label="pflt_CommercialServicesAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologySectorMember" xlink:label="us-gaap_TechnologySectorMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionMember" xlink:label="pflt_MediaDiversifiedAndProductionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AerospaceAndDefenseMember" xlink:label="pflt_AerospaceAndDefenseMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BusinessServicesMember" xlink:label="pflt_BusinessServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyMember" xlink:label="pflt_HealthcareTechnologyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HighTechIndustriesMember" xlink:label="pflt_HighTechIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndBuildingMember" xlink:label="pflt_ConstructionAndBuildingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AutomobilesIndustryMember" xlink:label="pflt_AutomobilesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsMember" xlink:label="pflt_DistributorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChemicalsPlasticsAndRubberMember" xlink:label="pflt_ChemicalsPlasticsAndRubberMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerServicesMember" xlink:label="pflt_ConsumerServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeisureProductsMember" xlink:label="pflt_LeisureProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesMember" xlink:label="pflt_DiversifiedConsumerServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedFinancialServicesMember" xlink:label="pflt_DiversifiedFinancialServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialServicesSectorMember" xlink:label="us-gaap_FinancialServicesSectorMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEquipmentAndSuppliesMember" xlink:label="pflt_HealthcareEquipmentAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelsRestaurantsAndLeisureMember" xlink:label="pflt_HotelsRestaurantsAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaAdvertisingPrintingAndPublishingMember" xlink:label="pflt_MediaAdvertisingPrintingAndPublishingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaBroadcastingAndSubscriptionMember" xlink:label="pflt_MediaBroadcastingAndSubscriptionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FoodProductsMember" xlink:label="pflt_FoodProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WholesaleMember" xlink:label="pflt_WholesaleMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BankingFinanceInsuranceAndRealEstateMember" xlink:label="pflt_BankingFinanceInsuranceAndRealEstateMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BuildingProductsMember" xlink:label="pflt_BuildingProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TextilesApparelAndLuxuryGoodsMember" xlink:label="pflt_TextilesApparelAndLuxuryGoodsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringMember" xlink:label="pflt_ConstructionAndEngineeringMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnergyEquipmentAndServicesMember" xlink:label="pflt_EnergyEquipmentAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HealthcareSectorMember" xlink:label="us-gaap_HealthcareSectorMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelGamingAndLeisureMember" xlink:label="pflt_HotelGamingAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceMember" xlink:label="pflt_InsuranceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AirFreightAndLogisticsMember" xlink:label="pflt_AirFreightAndLogisticsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BeverageFoodAndTobaccoMember" xlink:label="pflt_BeverageFoodAndTobaccoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerGoodsDurableMember" xlink:label="pflt_ConsumerGoodsDurableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerGoodsNonDurableMember" xlink:label="pflt_ConsumerGoodsNonDurableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EnvironmentalIndustriesMember" xlink:label="pflt_EnvironmentalIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareAndPharmaceuticalsMember" xlink:label="pflt_HealthcareAndPharmaceuticalsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RetailIndustriesMember" xlink:label="pflt_RetailIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TelecommunicationsMember" xlink:label="pflt_TelecommunicationsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AllOtherIndustriesMember" xlink:label="pflt_AllOtherIndustriesMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_InvestmentHoldingsLineItems" xlink:to="us-gaap_InvestmentHoldingsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_InvestmentHoldingsTable" xlink:to="us-gaap_EquitySecuritiesByIndustryAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_EquitySecuritiesByIndustryAxis" xlink:to="us-gaap_EquitySecuritiesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentHoldingsLineItems" xlink:to="pflt_FairValueInvestmentsOfPortfolioAssetsExcludingCashAndCashEquivalentsPercentage" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ProfessionalServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_PersonalProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_TechnologySectorMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AerospaceAndDefenseMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BusinessServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HighTechIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndBuildingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AutomobilesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ChemicalsPlasticsAndRubberMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_LeisureProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedFinancialServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_FinancialServicesSectorMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEquipmentAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelsRestaurantsAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaAdvertisingPrintingAndPublishingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaBroadcastingAndSubscriptionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_FoodProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_WholesaleMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BankingFinanceInsuranceAndRealEstateMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BuildingProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TextilesApparelAndLuxuryGoodsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnergyEquipmentAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_HealthcareSectorMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelGamingAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AirFreightAndLogisticsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BeverageFoodAndTobaccoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerGoodsDurableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerGoodsNonDurableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EnvironmentalIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareAndPharmaceuticalsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_RetailIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TelecommunicationsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AllOtherIndustriesMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsSummaryOfPSSLSPortfolioAtFairValueDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtFairValue" xlink:label="us-gaap_InvestmentOwnedAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NumberOfPortfolioCompanies" xlink:label="pflt_NumberOfPortfolioCompanies"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LargestPortfolioCompanyInvestment" xlink:label="pflt_LargestPortfolioCompanyInvestment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TotalInvestmentOwnedAtFairValue" xlink:label="pflt_TotalInvestmentOwnedAtFairValue"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_NumberOfPortfolioCompanies" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_LargestPortfolioCompanyInvestment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_TotalInvestmentOwnedAtFairValue" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsSummaryOfListingOfPSSLSIndividualInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember" xlink:label="pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="srt_EquityMethodInvesteeNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AdNetAcquisitionLLCMember" xlink:label="pflt_AdNetAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanBMember" xlink:label="pflt_TermLoanBMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesByIndustryAxis" xlink:label="us-gaap_EquitySecuritiesByIndustryAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesIndustryMember" xlink:label="us-gaap_EquitySecuritiesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaMember" xlink:label="pflt_MediaMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentInKindPIKNoteMember" xlink:label="us-gaap_PaymentInKindPIKNoteMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="us-gaap_StatementClassOfStockAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain" xlink:label="us-gaap_ClassOfStockDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesAOneEquitySecuritiesMember" xlink:label="pflt_SeriesAOneEquitySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralAxis" xlink:label="us-gaap_CollateralAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralDomain" xlink:label="us-gaap_CollateralDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralDomain" xlink:label="us-gaap_CollateralDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesMember" xlink:label="us-gaap_EquitySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentMaturityDate" xlink:label="us-gaap_InvestmentMaturityDate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember" xlink:label="pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AutomobilesMember" xlink:label="us-gaap_AutomobilesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AlpineAcquisitionCorpIIMember" xlink:label="pflt_AlpineAcquisitionCorpIIMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TermLoanCMember" xlink:label="pflt_TermLoanCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PaymentInKindPIKNoteOneMember" xlink:label="pflt_PaymentInKindPIKNoteOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesAAEquitySecuritiesMember" xlink:label="pflt_SeriesAAEquitySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IndustryName" xlink:label="pflt_IndustryName"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BusinessServicesMember" xlink:label="pflt_BusinessServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AltamiraTechnologiesLLCMember" xlink:label="pflt_AltamiraTechnologiesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SuperPriorityFirstLienTermLoanMember" xlink:label="pflt_SuperPriorityFirstLienTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PaymentInKindPIKNoteTwoMember" xlink:label="pflt_PaymentInKindPIKNoteTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeriesBEquitySecuritiesMember" xlink:label="pflt_SeriesBEquitySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentInterestRate" xlink:label="us-gaap_InvestmentInterestRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtOneTwoEightZeroPointEightMember" xlink:label="pflt_FirstLienSecuredDebtOneTwoEightZeroPointEightMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BuildingProductsMember" xlink:label="pflt_BuildingProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AmericanInsulatedGlassLLCMember" xlink:label="pflt_AmericanInsulatedGlassLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SuperPriorityFirstLienUnfundedTermLoanMember" xlink:label="pflt_SuperPriorityFirstLienUnfundedTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PaymentInKindPIKNoteThreeMember" xlink:label="pflt_PaymentInKindPIKNoteThreeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateTerms" xlink:label="us-gaap_DebtInstrumentInterestRateTerms"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnteriadLlcFKAMeritDirectLlcMember" xlink:label="pflt_AnteriadLlcFKAMeritDirectLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnfundedTermLoanMember" xlink:label="pflt_UnfundedTermLoanMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSecuredDebtMember" xlink:label="pflt_SecondLienSecuredDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedConsumerServicesMember" xlink:label="pflt_DiversifiedConsumerServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DebtInstrumentInterestParAmount" xlink:label="pflt_DebtInstrumentInterestParAmount"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PaymentInKindPIKNoteFourMember" xlink:label="pflt_PaymentInKindPIKNoteFourMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AnyHourServicesMember" xlink:label="pflt_AnyHourServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommercialServicesAndSuppliesMember" xlink:label="pflt_CommercialServicesAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentPaymentInKindInterestRate" xlink:label="pflt_InvestmentPaymentInKindInterestRate"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ApexServicePartnersLLCMember" xlink:label="pflt_ApexServicePartnersLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HighTechIndustriesMember" xlink:label="pflt_HighTechIndustriesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedBalanceShares" xlink:label="us-gaap_InvestmentOwnedBalanceShares"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsAndCashEquivalentsMember" xlink:label="pflt_InvestmentsAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AppliedTechnicalServicesLLCMember" xlink:label="pflt_AppliedTechnicalServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtCost" xlink:label="us-gaap_InvestmentOwnedAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerProductsMember" xlink:label="pflt_ConsumerProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ArcfieldAcquisitionCorpMember" xlink:label="pflt_ArcfieldAcquisitionCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtFairValue" xlink:label="us-gaap_InvestmentOwnedAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SoftwareMember" xlink:label="pflt_SoftwareMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BetaPlusTechnologiesIncMember" xlink:label="pflt_BetaPlusTechnologiesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LiabilitiesInExcessOfOtherAssets" xlink:label="pflt_LiabilitiesInExcessOfOtherAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AerospaceAndDefenseMember" xlink:label="pflt_AerospaceAndDefenseMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BlackhawkIndustrialDistributionIncMember" xlink:label="pflt_BlackhawkIndustrialDistributionIncMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MembersEquity" xlink:label="us-gaap_MembersEquity"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEducationAndChildcareMember" xlink:label="pflt_HealthcareEducationAndChildcareMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BroderBrosCoMember" xlink:label="pflt_BroderBrosCoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndEngineeringMember" xlink:label="pflt_ConstructionAndEngineeringMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ByLightProfessionalITServicesLLCMember" xlink:label="pflt_ByLightProfessionalITServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AutomobilesIndustryMember" xlink:label="pflt_AutomobilesIndustryMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CadenceAerospaceLLCMember" xlink:label="pflt_CadenceAerospaceLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChemicalsPlasticsAndRubberMember" xlink:label="pflt_ChemicalsPlasticsAndRubberMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CartessaAestheticsLLCMember" xlink:label="pflt_CartessaAestheticsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PersonalProductsMember" xlink:label="pflt_PersonalProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CanoHealthMember" xlink:label="pflt_CanoHealthMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerGoodsDurableMember" xlink:label="pflt_ConsumerGoodsDurableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CF512IncMember" xlink:label="pflt_CF512IncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ContainersAndPackagingMember" xlink:label="pflt_ContainersAndPackagingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CHAHoldingsIncMember" xlink:label="pflt_CHAHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelsRestaurantsAndLeisureMember" xlink:label="pflt_HotelsRestaurantsAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ChallengerPerformanceOptimizationIncMember" xlink:label="pflt_ChallengerPerformanceOptimizationIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ElectronicEquipmentInstrumentsAndComponentsMember" xlink:label="pflt_ElectronicEquipmentInstrumentsAndComponentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConnatixBuyerIncMember" xlink:label="pflt_ConnatixBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITServicesMember" xlink:label="pflt_ITServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CoolSysIncMember" xlink:label="pflt_CoolSysIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DistributorsMember" xlink:label="pflt_DistributorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CraneOneServicesIncMember" xlink:label="pflt_CraneOneServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DiversifiedFinancialServicesMember" xlink:label="pflt_DiversifiedFinancialServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CrashChampionsLLCMember" xlink:label="pflt_CrashChampionsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TradingCompaniesAndDistributorsMember" xlink:label="pflt_TradingCompaniesAndDistributorsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DigitalRoomHoldingsIncMember" xlink:label="pflt_DigitalRoomHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InsuranceMember" xlink:label="pflt_InsuranceMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DouglasProductsAndPackagingCompanyLLCMember" xlink:label="pflt_DouglasProductsAndPackagingCompanyLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CapitalEquipmentMember" xlink:label="pflt_CapitalEquipmentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DouglasSewerIntermediateLLCMember" xlink:label="pflt_DouglasSewerIntermediateLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareProvidersAndServicesMember" xlink:label="pflt_HealthcareProvidersAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DrSquatchLLCMember" xlink:label="pflt_DrSquatchLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HotelGamingAndLeisureMember" xlink:label="pflt_HotelGamingAndLeisureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DriHoldingIncMember" xlink:label="pflt_DriHoldingIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionMember" xlink:label="pflt_MediaDiversifiedAndProductionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DRSHoldingsIIIIncMember" xlink:label="pflt_DRSHoldingsIIIIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionOneMember" xlink:label="pflt_MediaDiversifiedAndProductionOneMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DuracoSpecialtyTapesLLCMember" xlink:label="pflt_DuracoSpecialtyTapesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaDiversifiedAndProductionTwoMember" xlink:label="pflt_MediaDiversifiedAndProductionTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EastValleyTouristDevelopmentAuthorityMember" xlink:label="pflt_EastValleyTouristDevelopmentAuthorityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InternetSoftwareAndServicesMember" xlink:label="pflt_InternetSoftwareAndServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECLEntertainmentLLCMember" xlink:label="pflt_ECLEntertainmentLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaAdvertisingPrintingAndPublishingMember" xlink:label="pflt_MediaAdvertisingPrintingAndPublishingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ECMIndustriesLLCMember" xlink:label="pflt_ECMIndustriesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEducationAndCultureMember" xlink:label="pflt_HealthcareEducationAndCultureMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ExigoIntermediateIILLCMember" xlink:label="pflt_ExigoIntermediateIILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConsumerGoodsNonDurableMember" xlink:label="pflt_ConsumerGoodsNonDurableMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairbanksMoreDefenseMember" xlink:label="pflt_FairbanksMoreDefenseMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareEquipmentAndSuppliesMember" xlink:label="pflt_HealthcareEquipmentAndSuppliesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FlexPrintLLCMember" xlink:label="pflt_FlexPrintLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareTechnologyMember" xlink:label="pflt_HealthcareTechnologyMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GantechAcquisitionCorpMember" xlink:label="pflt_GantechAcquisitionCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AirFreightAndLogisticsMember" xlink:label="pflt_AirFreightAndLogisticsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GlobalHoldingsInterCoLLCMember" xlink:label="pflt_GlobalHoldingsInterCoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ConstructionAndBuildingMember" xlink:label="pflt_ConstructionAndBuildingMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_GraffitiBuyerIncMember" xlink:label="pflt_GraffitiBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WholesaleMember" xlink:label="pflt_WholesaleMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HancockRoofingAndConstructionLLCMember" xlink:label="pflt_HancockRoofingAndConstructionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TextilesApparelAndLuxuryGoodsMember" xlink:label="pflt_TextilesApparelAndLuxuryGoodsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HoldcoSandsIntermediateLLCMember" xlink:label="pflt_HoldcoSandsIntermediateLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_EducationMember" xlink:label="pflt_EducationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HWHoldcoLLCMember" xlink:label="pflt_HWHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LeisureProductsMember" xlink:label="pflt_LeisureProductsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IconPartnersIiiLpMember" xlink:label="pflt_IconPartnersIiiLpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ProfessionalServicesMember" xlink:label="pflt_ProfessionalServicesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IDCInfusionServicesIncMember" xlink:label="pflt_IDCInfusionServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HealthcareAndPharmaceuticalsMember" xlink:label="pflt_HealthcareAndPharmaceuticalsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ImagineAcquisitioncoLLCMember" xlink:label="pflt_ImagineAcquisitioncoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_HomeAndOfficeFurnishingsHousewaresMember" xlink:label="pflt_HomeAndOfficeFurnishingsHousewaresMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InceptionFertilityVenturesLLCMember" xlink:label="pflt_InceptionFertilityVenturesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BeverageFoodAndTobaccoMember" xlink:label="pflt_BeverageFoodAndTobaccoMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IconPartnersVCLPMember" xlink:label="pflt_IconPartnersVCLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TelecommunicationsMember" xlink:label="pflt_TelecommunicationsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IMIAHoldingsIncMember" xlink:label="pflt_IMIAHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MediaBroadcastingAndSubscriptionMember" xlink:label="pflt_MediaBroadcastingAndSubscriptionMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IntegrativeNutritionLLCMember" xlink:label="pflt_IntegrativeNutritionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_IntegrityMarketingAcquisitionLLCMember" xlink:label="pflt_IntegrityMarketingAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ITIHoldingsIncMember" xlink:label="pflt_ITIHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_K2PureSolutionsNoCalLPMember" xlink:label="pflt_K2PureSolutionsNoCalLPMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_KineticPurchaserLLCMember" xlink:label="pflt_KineticPurchaserLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LashOpCoLLCMember" xlink:label="pflt_LashOpCoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LAVGearHoldingsIncMember" xlink:label="pflt_LAVGearHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LightspeedBuyerIncMember" xlink:label="pflt_LightspeedBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LuckyBucksLLCMember" xlink:label="pflt_LuckyBucksLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MagentaBuyerLLCMember" xlink:label="pflt_MagentaBuyerLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarketplaceEventsLLCMember" xlink:label="pflt_MarketplaceEventsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarsAcquisitionHoldingsCorpMember" xlink:label="pflt_MarsAcquisitionHoldingsCorpMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MBSHoldingsIncMember" xlink:label="pflt_MBSHoldingsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MdiBuyerIncMember" xlink:label="pflt_MdiBuyerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeadowlarkAcquirerLLCMember" xlink:label="pflt_MeadowlarkAcquirerLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OwlAcquisitionLLCMember" xlink:label="pflt_OwlAcquisitionLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeritDirectLLCMember" xlink:label="pflt_MeritDirectLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MissionCriticalElectronicsIncMember" xlink:label="pflt_MissionCriticalElectronicsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MunicipalEmergencyServicesIncMember" xlink:label="pflt_MunicipalEmergencyServicesIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NBHGroupLLCMember" xlink:label="pflt_NBHGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NewMilaniGroupLLCMember" xlink:label="pflt_NewMilaniGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OISManagementServicesLLCMember" xlink:label="pflt_OISManagementServicesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OneStopMailingLLCMember" xlink:label="pflt_OneStopMailingLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OutputServicesGroupIncMember" xlink:label="pflt_OutputServicesGroupIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OxTwoLLCMember" xlink:label="pflt_OxTwoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PHBeautyHoldingsIIIIncMember" xlink:label="pflt_PHBeautyHoldingsIIIIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PLAcquisitioncoLLCMember" xlink:label="pflt_PLAcquisitioncoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PlantHealthIntermediateIncMember" xlink:label="pflt_PlantHealthIntermediateIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PlayPowerIncMember" xlink:label="pflt_PlayPowerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PragmaticInstituteLlcMember" xlink:label="pflt_PragmaticInstituteLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_QuanticElectronicsLLCMember" xlink:label="pflt_QuanticElectronicsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ReceptionPurchaserLlcMember" xlink:label="pflt_ReceptionPurchaserLlcMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RecteqLLCMember" xlink:label="pflt_RecteqLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ResearchNowGroupIncAndDynataLLCMember" xlink:label="pflt_ResearchNowGroupIncAndDynataLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ResearchNowGroupIncAndSurveySamplingInternationalLLCMember" xlink:label="pflt_ResearchNowGroupIncAndSurveySamplingInternationalLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SalesBenchmarkIndexLLCMember" xlink:label="pflt_SalesBenchmarkIndexLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SargentAndGreenleafIncMember" xlink:label="pflt_SargentAndGreenleafIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SchlesingerGlobalIncMember" xlink:label="pflt_SchlesingerGlobalIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SigmaDefenseSystemsLLCMember" xlink:label="pflt_SigmaDefenseSystemsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SmileBrandsIncMember" xlink:label="pflt_SmileBrandsIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SnakClubLLCMember" xlink:label="pflt_SnakClubLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SolutionreachIncMember" xlink:label="pflt_SolutionreachIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SpectacleGaryHoldingsLLCMember" xlink:label="pflt_SpectacleGaryHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SpendmendHoldingsLLCMember" xlink:label="pflt_SpendmendHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_STVGroupIncorporatedMember" xlink:label="pflt_STVGroupIncorporatedMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TACLifePortPurchaserLLCMember" xlink:label="pflt_TACLifePortPurchaserLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember" xlink:label="pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TeleGuamHoldingsLLCMember" xlink:label="pflt_TeleGuamHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TeneoHoldingsLLCMember" xlink:label="pflt_TeneoHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheAegisTechnologiesGroupLLCMember" xlink:label="pflt_TheAegisTechnologiesGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheBluebirdGroupLLCMember" xlink:label="pflt_TheBluebirdGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheInfosoftGroupLLCMember" xlink:label="pflt_TheInfosoftGroupLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TheVertexCompaniesLLCMember" xlink:label="pflt_TheVertexCompaniesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TPCCanadaParentIncAndTPCUSParentLLCMember" xlink:label="pflt_TPCCanadaParentIncAndTPCUSParentLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TVCEnterprisesLLCMember" xlink:label="pflt_TVCEnterprisesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TWSAcquisitionCorporationMember" xlink:label="pflt_TWSAcquisitionCorporationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TytoAtheneLLCMember" xlink:label="pflt_TytoAtheneLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UBEOLLCMember" xlink:label="pflt_UBEOLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UrologyManagementAssociatesLLCMember" xlink:label="pflt_UrologyManagementAssociatesLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UniqueIndoorComfortLLCMember" xlink:label="pflt_UniqueIndoorComfortLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WalkerEdisonFurnitureCompanyLLCMember" xlink:label="pflt_WalkerEdisonFurnitureCompanyLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_WildcatBuyercoIncMember" xlink:label="pflt_WildcatBuyercoIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DBIIntermediateHoldcoLLCMember" xlink:label="pflt_DBIIntermediateHoldcoLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InventusPowerIncMember" xlink:label="pflt_InventusPowerIncMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NewMPEHoldingsLLCMember" xlink:label="pflt_NewMPEHoldingsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_BlackRockFederalFDInstitutional30Member" xlink:label="pflt_BlackRockFederalFDInstitutional30Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_USBankCashMember" xlink:label="pflt_USBankCashMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ZipsCarWashLLCMember" xlink:label="pflt_ZipsCarWashLLCMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="srt_EquityMethodInvesteeNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AdNetAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanBMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_EquitySecuritiesByIndustryAxis" xlink:to="us-gaap_EquitySecuritiesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_PaymentInKindPIKNoteMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesAOneEquitySecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CollateralAxis" xlink:to="us-gaap_CollateralDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_CollateralAxis" xlink:to="us-gaap_CollateralDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CollateralDomain" xlink:to="us-gaap_EquitySecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentMaturityDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="us-gaap_AutomobilesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AlpineAcquisitionCorpIIMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TermLoanCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_PaymentInKindPIKNoteOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesAAEquitySecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_IndustryName" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BusinessServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AltamiraTechnologiesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_SuperPriorityFirstLienTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_PaymentInKindPIKNoteTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="pflt_SeriesBEquitySecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentInterestRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtOneTwoEightZeroPointEightMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BuildingProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AmericanInsulatedGlassLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_SuperPriorityFirstLienUnfundedTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_PaymentInKindPIKNoteThreeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateTerms" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AnteriadLlcFKAMeritDirectLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_UnfundedTermLoanMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_SecondLienSecuredDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedConsumerServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_DebtInstrumentInterestParAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_EquitySecuritiesByIndustryAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_PaymentInKindPIKNoteFourMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AnyHourServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CommercialServicesAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentPaymentInKindInterestRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_CashAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ApexServicePartnersLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HighTechIndustriesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedBalanceShares" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_StatementClassOfStockAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_AppliedTechnicalServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_CollateralAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ArcfieldAcquisitionCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_InvestmentOwnedAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_SoftwareMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BetaPlusTechnologiesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_LiabilitiesInExcessOfOtherAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AerospaceAndDefenseMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BlackhawkIndustrialDistributionIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_MembersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEducationAndChildcareMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BroderBrosCoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndEngineeringMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ByLightProfessionalITServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AutomobilesIndustryMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CadenceAerospaceLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ChemicalsPlasticsAndRubberMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CartessaAestheticsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_PersonalProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CanoHealthMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerGoodsDurableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CF512IncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ContainersAndPackagingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CHAHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelsRestaurantsAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ChallengerPerformanceOptimizationIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ElectronicEquipmentInstrumentsAndComponentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ConnatixBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ITServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CoolSysIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DistributorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CraneOneServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_DiversifiedFinancialServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CrashChampionsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TradingCompaniesAndDistributorsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DigitalRoomHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InsuranceMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DouglasProductsAndPackagingCompanyLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_CapitalEquipmentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DouglasSewerIntermediateLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareProvidersAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DrSquatchLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="26" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HotelGamingAndLeisureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DriHoldingIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="27" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DRSHoldingsIIIIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="28" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionOneMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DuracoSpecialtyTapesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="29" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaDiversifiedAndProductionTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_EastValleyTouristDevelopmentAuthorityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="30" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_InternetSoftwareAndServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECLEntertainmentLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="31" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaAdvertisingPrintingAndPublishingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ECMIndustriesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="32" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEducationAndCultureMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ExigoIntermediateIILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="33" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConsumerGoodsNonDurableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_FairbanksMoreDefenseMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="34" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareEquipmentAndSuppliesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_FlexPrintLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="35" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareTechnologyMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GantechAcquisitionCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="36" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_AirFreightAndLogisticsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GlobalHoldingsInterCoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="37" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ConstructionAndBuildingMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_GraffitiBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="38" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_WholesaleMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HancockRoofingAndConstructionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="39" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TextilesApparelAndLuxuryGoodsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HoldcoSandsIntermediateLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="40" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_EducationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_HWHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="41" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_LeisureProductsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IconPartnersIiiLpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="42" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_ProfessionalServicesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IDCInfusionServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="43" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HealthcareAndPharmaceuticalsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="44" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ImagineAcquisitioncoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="44" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_HomeAndOfficeFurnishingsHousewaresMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="45" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InceptionFertilityVenturesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="45" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_BeverageFoodAndTobaccoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="46" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IconPartnersVCLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="46" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_TelecommunicationsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="47" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IMIAHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="47" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquitySecuritiesIndustryMember" xlink:to="pflt_MediaBroadcastingAndSubscriptionMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="48" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IntegrativeNutritionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="49" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_IntegrityMarketingAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="50" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ITIHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="51" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_K2PureSolutionsNoCalLPMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="52" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_KineticPurchaserLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="53" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LashOpCoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="54" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LAVGearHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="55" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LightspeedBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="56" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LuckyBucksLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="57" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MagentaBuyerLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="58" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarketplaceEventsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="59" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarsAcquisitionHoldingsCorpMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="60" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MBSHoldingsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="61" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MdiBuyerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="62" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeadowlarkAcquirerLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="63" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OwlAcquisitionLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="64" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MeritDirectLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="65" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MissionCriticalElectronicsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="66" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MunicipalEmergencyServicesIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="67" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NBHGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="68" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NewMilaniGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="69" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OISManagementServicesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="70" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OneStopMailingLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="71" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OutputServicesGroupIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="72" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_OxTwoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="73" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PHBeautyHoldingsIIIIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="74" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PLAcquisitioncoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="75" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PlantHealthIntermediateIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="76" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PlayPowerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="77" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PragmaticInstituteLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="78" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_QuanticElectronicsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="79" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ReceptionPurchaserLlcMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="80" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_RecteqLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="81" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ResearchNowGroupIncAndDynataLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="82" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ResearchNowGroupIncAndSurveySamplingInternationalLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="83" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SalesBenchmarkIndexLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="84" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SargentAndGreenleafIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="85" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SchlesingerGlobalIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="86" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SigmaDefenseSystemsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="87" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SmileBrandsIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="88" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SnakClubLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="89" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SolutionreachIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="90" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SpectacleGaryHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="91" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SpendmendHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="92" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_STVGroupIncorporatedMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="93" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TACLifePortPurchaserLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="94" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_SystemPlanningAndAnalysisIncFKAManagementConsultingAndResearchLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="95" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TeleGuamHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="96" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TeneoHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="97" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheAegisTechnologiesGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="98" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheBluebirdGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="99" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheInfosoftGroupLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="100" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TheVertexCompaniesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="101" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TPCCanadaParentIncAndTPCUSParentLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="102" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TVCEnterprisesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="103" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TWSAcquisitionCorporationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="104" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_TytoAtheneLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="105" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UBEOLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="106" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UrologyManagementAssociatesLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="107" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_UniqueIndoorComfortLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="108" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WalkerEdisonFurnitureCompanyLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="109" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_WildcatBuyercoIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="110" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DBIIntermediateHoldcoLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="111" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_InventusPowerIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="112" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_NewMPEHoldingsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="113" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_BlackRockFederalFDInstitutional30Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="114" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_USBankCashMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="115" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_ZipsCarWashLLCMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/DisclosureInvestmentsSummaryOfListingOfPsslsIndividualInvestmentsParentheticalDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsLineItems" xlink:label="us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentOwnedPercentageOfNetAssets" xlink:label="pflt_InvestmentOwnedPercentageOfNetAssets"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsMember" xlink:label="us-gaap_CashAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralDomain" xlink:label="us-gaap_CollateralDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquitySecuritiesMember" xlink:label="us-gaap_EquitySecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CollateralAxis" xlink:label="us-gaap_CollateralAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember" xlink:label="pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebt12808Member" xlink:label="pflt_FirstLienSecuredDebt12808Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentOwnedPercentOfLiabilitiesInExcessOfOtherAssets" xlink:label="pflt_InvestmentOwnedPercentOfLiabilitiesInExcessOfOtherAssets"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsAndCashEquivalentsMember" xlink:label="pflt_InvestmentsAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember" xlink:label="pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentOwnedPercentOfMembersEquity" xlink:label="pflt_InvestmentOwnedPercentOfMembersEquity"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSecuredDebtMember" xlink:label="pflt_SecondLienSecuredDebtMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentOwnedPercentageOfNetAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_CashAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CollateralDomain" xlink:to="us-gaap_EquitySecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CollateralAxis" xlink:to="us-gaap_CollateralDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtOneTwoSixSevenPointSevenPercentageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebt12808Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentOwnedPercentOfLiabilitiesInExcessOfOtherAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_InvestmentsAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_FirstLienSecuredDebtOneThousandEightyEightPercentMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfInvestmentsLineItems" xlink:to="pflt_InvestmentOwnedPercentOfMembersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_CollateralAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_SecondLienSecuredDebtMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract" xlink:label="us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtFairValue" xlink:label="us-gaap_InvestmentOwnedAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtNet" xlink:label="pflt_AssetBackedDebtNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestReceivable" xlink:label="us-gaap_InterestReceivable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="us-gaap_CommitmentsAndContingencies"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PayableForInvestmentsPurchased" xlink:label="pflt_PayableForInvestmentsPurchased"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ReceivableForInvestmentsSold" xlink:label="pflt_ReceivableForInvestmentsSold"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MembersEquity" xlink:label="us-gaap_MembersEquity"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InterestPayableOnCreditFacility" xlink:label="pflt_InterestPayableOnCreditFacility"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrepaidExpenseAndOtherAssets" xlink:label="us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestPayableCurrentAndNoncurrent" xlink:label="us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets" xlink:label="us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Liabilities" xlink:label="us-gaap_Liabilities"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LineOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AssetsAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_InvestmentOwnedAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_AssetBackedDebtNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_NotesPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_InterestReceivable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommitmentsAndContingencies" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_PayableForInvestmentsPurchased" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="pflt_ReceivableForInvestmentsSold" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_MembersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="pflt_InterestPayableOnCreditFacility" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_PrepaidExpenseAndOtherAssets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_InterestPayableCurrentAndNoncurrent" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Assets" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_Liabilities" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfAssetsAndLiabilitiesForPSSLParentheticalDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentOwnedAtCost" xlink:label="us-gaap_InvestmentOwnedAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CashAndCashEquivalentsAtCost" xlink:label="pflt_CashAndCashEquivalentsAtCost"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtNetPar" xlink:label="pflt_AssetBackedDebtNetPar"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnfundedCommitmentsToFundInvestments" xlink:label="pflt_UnfundedCommitmentsToFundInvestments"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_InvestmentOwnedAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_CashAndCashEquivalentsAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_AssetBackedDebtNetPar" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_UnfundedCommitmentsToFundInvestments" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureInvestmentsConsolidatedStatementsOfOperationsForPSSLDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems" xlink:label="us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable" xlink:label="us-gaap_StatementTable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain" xlink:label="us-gaap_RelatedPartyDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredLoanFundILLCMember" xlink:label="pflt_PennantParkSeniorSecuredLoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetInvestmentIncomeAbstract" xlink:label="us-gaap_NetInvestmentIncomeAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="us-gaap_OperatingExpensesAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InterestAndExpensesOnCreditFacilityAndAssetBackedDebt" xlink:label="pflt_InterestAndExpensesOnCreditFacilityAndAssetBackedDebt"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract" xlink:label="pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnInvestments" xlink:label="us-gaap_GainLossOnInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIncome" xlink:label="us-gaap_OtherIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestAndDebtExpense" xlink:label="us-gaap_InterestAndDebtExpense"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="us-gaap_GeneralAndAdministrativeExpense"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt" xlink:label="pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherSellingGeneralAndAdministrativeExpense" xlink:label="us-gaap_OtherSellingGeneralAndAdministrativeExpense"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpenses" xlink:label="us-gaap_CostsAndExpenses"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetInvestmentIncome" xlink:label="us-gaap_NetInvestmentIncome"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease" xlink:label="us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="pflt_PennantParkSeniorSecuredLoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_NetInvestmentIncomeAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_InvestmentIncomeInterest" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="pflt_InterestAndExpensesOnCreditFacilityAndAssetBackedDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract" xlink:to="us-gaap_GainLossOnInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_OtherIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_InterestAndDebtExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_RealizedAndUnrealizedLossGainOnInvestmentsAndDebtAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossBeforeTax" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_GeneralAndAdministrativeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="pflt_NetRealizedAndUnrealizedLossGainFromInvestmentsAndDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OtherSellingGeneralAndAdministrativeExpense" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_OperatingExpensesAbstract" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_CostsAndExpenses" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetInvestmentIncomeAbstract" xlink:to="us-gaap_NetInvestmentIncome" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInUnrealizedDepreciationAppreciationAbstract" xlink:to="us-gaap_InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfUnobservableInputsAndRangesDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienMember" xlink:label="pflt_FirstLienMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="us-gaap_FairValueByAssetClassAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentsMember" xlink:label="us-gaap_EquityMethodInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LongTermCreditFacilityMember" xlink:label="pflt_LongTermCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="us-gaap_ValuationTechniqueAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="us-gaap_ValuationTechniqueDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="us-gaap_ValuationTechniqueDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ValuationTechniqueMarketComparableMember" xlink:label="pflt_ValuationTechniqueMarketComparableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="us-gaap_MeasurementInputTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="us-gaap_MeasurementInputTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="us-gaap_MeasurementInputTypeDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeasurementInputBrokerOrDealerBidsOrQuotesMember" xlink:label="pflt_MeasurementInputBrokerOrDealerBidsOrQuotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AlternativeInvestment" xlink:label="us-gaap_AlternativeInvestment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienMember" xlink:label="pflt_SecondLienMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ValuationTechniqueEnterpriseMarketValueMember" xlink:label="pflt_ValuationTechniqueEnterpriseMarketValueMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeasurementInputMarketYieldMember" xlink:label="pflt_MeasurementInputMarketYieldMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AlternativeInvestmentMeasurementInput" xlink:label="us-gaap_AlternativeInvestmentMeasurementInput"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputEbitdaMultipleMember" xlink:label="us-gaap_MeasurementInputEbitdaMultipleMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_WeightedAverageMember" xlink:label="srt_WeightedAverageMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MeasurementInputOnDiscountForLackOfMarketabilityMember" xlink:label="pflt_MeasurementInputOnDiscountForLackOfMarketabilityMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByAssetClassAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByAssetClassAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:to="us-gaap_EquityMethodInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_LongTermCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ValuationTechniqueAxis" xlink:to="us-gaap_ValuationTechniqueDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ValuationTechniqueAxis" xlink:to="us-gaap_ValuationTechniqueDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ValuationTechniqueDomain" xlink:to="pflt_ValuationTechniqueMarketComparableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_MeasurementInputTypeAxis" xlink:to="us-gaap_MeasurementInputTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_MeasurementInputTypeAxis" xlink:to="us-gaap_MeasurementInputTypeDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MeasurementInputTypeDomain" xlink:to="pflt_MeasurementInputBrokerOrDealerBidsOrQuotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_AlternativeInvestment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_SecondLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ValuationTechniqueDomain" xlink:to="pflt_ValuationTechniqueEnterpriseMarketValueMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MeasurementInputTypeDomain" xlink:to="pflt_MeasurementInputMarketYieldMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:to="us-gaap_AlternativeInvestmentMeasurementInput" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_FairValueByAssetClassAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MeasurementInputTypeDomain" xlink:to="us-gaap_MeasurementInputEbitdaMultipleMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_WeightedAverageMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MeasurementInputTypeDomain" xlink:to="pflt_MeasurementInputOnDiscountForLackOfMarketabilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_ValuationTechniqueAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="us-gaap_MeasurementInputTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsSummaryOfInvestmentsCashAndCashEquivalentsCreditFacilityOrPriorCreditFacilityNotesAndAssetBackedDebtDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienMember" xlink:label="pflt_FirstLienMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="us-gaap_FinancialInstrumentAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesPayableMember" xlink:label="pflt_TwoThousandTwentyThreeNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsFairValueDisclosure" xlink:label="us-gaap_InvestmentsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienMember" xlink:label="pflt_SecondLienMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentySixNotesPayableMember" xlink:label="pflt_TwoThousandTwentySixNotesPayableMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_InvestmentsAndCashAndCashEquivalentsFairValueDisclosure" xlink:label="pflt_InvestmentsAndCashAndCashEquivalentsFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentsMember" xlink:label="us-gaap_EquityMethodInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandThirtyOneAssetBackedDebtMember" xlink:label="pflt_TwoThousandThirtyOneAssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" xlink:label="us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LinesOfCreditFairValueDisclosure" xlink:label="us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="pflt_TwoThousandTwentyThreeNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_InvestmentsFairValueDisclosure" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_SecondLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="pflt_TwoThousandTwentySixNotesPayableMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_CashAndCashEquivalentsFairValueDisclosure" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="pflt_InvestmentsAndCashAndCashEquivalentsFairValueDisclosure" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_EquityMethodInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:to="us-gaap_FinancialInstrumentAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="pflt_TwoThousandThirtyOneAssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_LinesOfCreditFairValueDisclosure" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:to="us-gaap_DebtInstrumentFairValue" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfInvestmentsMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="us-gaap_InvestmentTypeCategorizationMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FirstLienMember" xlink:label="pflt_FirstLienMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SecondLienSubordinatedDebtAndEquityInvestmentsMember" xlink:label="pflt_SecondLienSubordinatedDebtAndEquityInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList" xlink:label="us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputsUnrealizedAppreciationDepreciation" xlink:label="pflt_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputsUnrealizedAppreciationDepreciation"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList" xlink:label="us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_InvestmentTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_FirstLienMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="pflt_SecondLienSubordinatedDebtAndEquityInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="pflt_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputsUnrealizedAppreciationDepreciation" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersNet" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3Details">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LongTermCreditFacilityMember" xlink:label="pflt_LongTermCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityNetChangeInUnrealizedDepreciationAppreciationIncludedInEarnings" xlink:label="pflt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityNetChangeInUnrealizedDepreciationAppreciationIncludedInEarnings"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="pflt_LongTermCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_LineOfCreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="pflt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityNetChangeInUnrealizedDepreciationAppreciationIncludedInEarnings" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsReconciliationOfLiabilitiesMeasuredAtFairValueUsingSignificantUnobservableInputsLevel3ParentheticalDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LongTermCreditFacilityMember" xlink:label="pflt_LongTermCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueAtCost" xlink:label="pflt_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueAtCost"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="us-gaap_LineOfCreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="pflt_LongTermCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="pflt_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueAtCost" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsNetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsDetails">
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:label="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsTable" xlink:label="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PriorCreditFacilityMember" xlink:label="pflt_PriorCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LineOfCreditAtCost" xlink:label="pflt_LineOfCreditAtCost"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="us-gaap_DebtInstrumentCarryingAmount"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LineOfCreditFacilityResetDate" xlink:label="pflt_LineOfCreditFacilityResetDate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowings" xlink:label="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowings"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsTable" xlink:to="us-gaap_LineOfCreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="pflt_PriorCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="us-gaap_LineOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="pflt_LineOfCreditAtCost" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="us-gaap_DebtInstrumentCarryingAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="pflt_LineOfCreditFacilityResetDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowingsLineItems" xlink:to="pflt_NetChangeInFairValueOnForeignCurrencyTranslationOnOutstandingBorrowings" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureFairValueOfFinancialInstrumentsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="us-gaap_LineOfCreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LongTermCreditFacilityMember" xlink:label="pflt_LongTermCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LineOfCreditFacilityAmendmentCosts" xlink:label="pflt_LineOfCreditFacilityAmendmentCosts"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PriorCreditFacilityMember" xlink:label="pflt_PriorCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedAppreciationDepreciationOnDebt" xlink:label="pflt_NetChangeInUnrealizedAppreciationDepreciationOnDebt"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationOnDebt" xlink:label="pflt_NetChangeInUnrealizedDepreciationOnDebt"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="us-gaap_FairValueByBalanceSheetGroupingTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="us-gaap_LineOfCreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LineOfCreditFacilityAxis" xlink:to="us-gaap_LineOfCreditFacilityLenderDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="pflt_LongTermCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="pflt_LineOfCreditFacilityAmendmentCosts" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LineOfCreditFacilityLenderDomain" xlink:to="pflt_PriorCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="pflt_NetChangeInUnrealizedAppreciationDepreciationOnDebt" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="pflt_NetChangeInUnrealizedDepreciationOnDebt" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureTransactionsWithAffiliatedCompaniesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain_default"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NonControlledAffiliatedInvestmentsMember" xlink:label="pflt_NonControlledAffiliatedInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_OwnershipPercentageOfVotingSecurities" xlink:label="pflt_OwnershipPercentageOfVotingSecurities"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ControlledAffiliatedInvestmentsMember" xlink:label="pflt_ControlledAffiliatedInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:to="pflt_NonControlledAffiliatedInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="pflt_OwnershipPercentageOfVotingSecurities" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:to="pflt_ControlledAffiliatedInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureTransactionsWithAffiliatedCompaniesSummaryOfTransactionsWithAffiliatedCompaniesDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfInvestmentsTable" xlink:label="us-gaap_ScheduleOfInvestmentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NonControlledAffiliatedInvestmentsMember" xlink:label="pflt_NonControlledAffiliatedInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="srt_EquityMethodInvesteeNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_DBIHoldingLLCMember" xlink:label="pflt_DBIHoldingLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ControlledAffiliatedInvestmentsMember" xlink:label="pflt_ControlledAffiliatedInvestmentsMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CountryFreshHoldingCompanyIncMember" xlink:label="pflt_CountryFreshHoldingCompanyIncMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ControlledAndNonControlledAffiliatesMember" xlink:label="pflt_ControlledAndNonControlledAffiliatesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_MarketplaceEventsLLCMember" xlink:label="pflt_MarketplaceEventsLLCMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PennantParkSeniorSecuredMember" xlink:label="pflt_PennantParkSeniorSecuredMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease" xlink:label="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="us-gaap_InvestmentIncomeInterest"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_LoanFundILLCMember" xlink:label="pflt_LoanFundILLCMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InvestmentIncomeDividend" xlink:label="us-gaap_InvestmentIncomeDividend"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="us-gaap_RealizedInvestmentGainsLosses"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_ScheduleOfInvestmentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:to="pflt_NonControlledAffiliatedInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:to="srt_EquityMethodInvesteeNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_DBIHoldingLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:to="pflt_ControlledAffiliatedInvestmentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfInvestmentsTable" xlink:to="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_CountryFreshHoldingCompanyIncMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossAdditions" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValueGrossReductions" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationDomain" xlink:to="pflt_ControlledAndNonControlledAffiliatesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_MarketplaceEventsLLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_PennantParkSeniorSecuredMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentsInAndAdvancesToAffiliatesAtFairValuePeriodIncreaseDecrease" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentIncomeInterest" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_EquityMethodInvesteeNameDomain" xlink:to="pflt_LoanFundILLCMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_InvestmentIncomeDividend" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems" xlink:to="us-gaap_RealizedInvestmentGainsLosses" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureCashAndCashEquivalentsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsLineItems" xlink:label="us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAxis" xlink:label="us-gaap_CashAndCashEquivalentsAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_default"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="us-gaap_MoneyMarketFundsMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_CashAndCashEquivalentsLineItems" xlink:to="us-gaap_ScheduleOfCashAndCashEquivalentsTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfCashAndCashEquivalentsTable" xlink:to="us-gaap_CashAndCashEquivalentsAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CashAndCashEquivalentsAxis" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_CashAndCashEquivalentsAxis" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_default" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember" xlink:to="us-gaap_MoneyMarketFundsMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashAndCashEquivalentsLineItems" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureDebtAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable" xlink:label="us-gaap_DebtInstrumentTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="us-gaap_LongtermDebtTypeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="us-gaap_LongtermDebtTypeDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SBADebenturesMember" xlink:label="pflt_SBADebenturesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis" xlink:label="us-gaap_DebtInstrumentAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="us-gaap_DebtInstrumentNameDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndTwentyFourNotesMember" xlink:label="pflt_TwoThousandAndTwentyFourNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis" xlink:label="us-gaap_CreditFacilityAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain" xlink:label="us-gaap_CreditFacilityDomain"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_SeniorSecuritiesMember" xlink:label="pflt_SeniorSecuritiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis" xlink:label="us-gaap_VariableRateAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain" xlink:label="us-gaap_VariableRateDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" xlink:label="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementScenarioAxis" xlink:label="srt_StatementScenarioAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="srt_ScenarioUnspecifiedDomain"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScenarioForecastMember" xlink:label="srt_ScenarioForecastMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="us-gaap_DebtWeightedAverageInterestRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndTwentySixNotesMember" xlink:label="pflt_TwoThousandAndTwentySixNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TruistCreditFacilityMember" xlink:label="pflt_TruistCreditFacilityMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndThirtyOneAssetBackedDebtMember" xlink:label="pflt_TwoThousandAndThirtyOneAssetBackedDebtMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetCoverageRatio" xlink:label="pflt_AssetCoverageRatio"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandAndTwentySixNotesTwoMember" xlink:label="pflt_TwoThousandAndTwentySixNotesTwoMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCredit" xlink:label="us-gaap_LineOfCredit"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_TwoThousandTwentyThreeNotesMember" xlink:label="pflt_TwoThousandTwentyThreeNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate" xlink:label="us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassA1SeniorSecuredFloatingRateLoansMember" xlink:label="pflt_ClassA1SeniorSecuredFloatingRateLoansMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationDate1" xlink:label="us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassA2SeniorSecuredFixedRateNotesDue2031Member" xlink:label="pflt_ClassA2SeniorSecuredFixedRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CreditFacilityRevolvingPeriodEndDate" xlink:label="pflt_CreditFacilityRevolvingPeriodEndDate"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassB1SeniorSecuredFloatingRateNotesDue2031Member" xlink:label="pflt_ClassB1SeniorSecuredFloatingRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod" xlink:label="us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassB2SeniorSecuredFixedRateNotesDue2031Member" xlink:label="pflt_ClassB2SeniorSecuredFixedRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" xlink:label="us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassC1SecuredDeferrableFloatingRateNotesDue2031Member" xlink:label="pflt_ClassC1SecuredDeferrableFloatingRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfEquityInterestInFunding" xlink:label="pflt_PercentageOfEquityInterestInFunding"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassC2SecuredDeferrableFixedRateNotesDue2031Member" xlink:label="pflt_ClassC2SecuredDeferrableFixedRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesIssued1" xlink:label="us-gaap_NotesIssued1"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassDSecuredDeferrableFloatingRateLoansDue2031Member" xlink:label="pflt_ClassDSecuredDeferrableFloatingRateLoansDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NotesPayable" xlink:label="us-gaap_NotesPayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassA1SeniorSecuredFloatingRateNotesDue2031Member" xlink:label="pflt_ClassA1SeniorSecuredFloatingRateNotesDue2031Member"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod" xlink:label="us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_ClassDSecuredDeferrableFloatingRateNotesMember" xlink:label="pflt_ClassDSecuredDeferrableFloatingRateNotesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentPaymentTerms" xlink:label="us-gaap_DebtInstrumentPaymentTerms"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" xlink:label="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfOriginalPrincipalAmountPayable" xlink:label="pflt_PercentageOfOriginalPrincipalAmountPayable"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfPublicOfferingPricePerNotesIssued" xlink:label="pflt_PercentageOfPublicOfferingPricePerNotesIssued"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="us-gaap_DebtInstrumentMaturityDate"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtConversionOriginalDebtAmount1" xlink:label="us-gaap_DebtConversionOriginalDebtAmount1"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="us-gaap_DebtInstrumentFaceAmount"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" xlink:label="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfPreferredSharesOfSecuritizationIssuer" xlink:label="pflt_PercentageOfPreferredSharesOfSecuritizationIssuer"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PercentageOfNotesIssuedBySecuritizationIssuer" xlink:label="pflt_PercentageOfNotesIssuedBySecuritizationIssuer"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_PreferredSharesOfSecuritizationIssuer" xlink:label="pflt_PreferredSharesOfSecuritizationIssuer"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetBackedSecuritiesAtCarryingValue" xlink:label="us-gaap_AssetBackedSecuritiesAtCarryingValue"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_AssetBackedDebtUnamortizedFees" xlink:label="pflt_AssetBackedDebtUnamortizedFees"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_LongtermDebtTypeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_LongtermDebtTypeAxis" xlink:to="us-gaap_LongtermDebtTypeDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_SBADebenturesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_DebtInstrumentAxis" xlink:to="us-gaap_DebtInstrumentNameDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_TwoThousandAndTwentyFourNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_CreditFacilityAxis" xlink:to="us-gaap_CreditFacilityDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_SeniorSecuritiesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_VariableRateAxis" xlink:to="us-gaap_VariableRateDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_VariableRateDomain" xlink:to="us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ScenarioUnspecifiedDomain" xlink:to="srt_ScenarioForecastMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtWeightedAverageInterestRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_DebtInstrumentAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_TwoThousandAndTwentySixNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CreditFacilityDomain" xlink:to="pflt_TruistCreditFacilityMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LongtermDebtTypeDomain" xlink:to="pflt_TwoThousandAndThirtyOneAssetBackedDebtMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_AssetCoverageRatio" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_TwoThousandAndTwentySixNotesTwoMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_CreditFacilityAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="2" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LineOfCredit" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="us-gaap_VariableRateAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_TwoThousandTwentyThreeNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="3" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateBasisForEffectiveRate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_DebtInstrumentTable" xlink:to="srt_StatementScenarioAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassA1SeniorSecuredFloatingRateLoansMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="4" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LineOfCreditFacilityExpirationDate1" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassA2SeniorSecuredFixedRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="5" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_CreditFacilityRevolvingPeriodEndDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassB1SeniorSecuredFloatingRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="6" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassB2SeniorSecuredFixedRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="7" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassC1SecuredDeferrableFloatingRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="8" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfEquityInterestInFunding" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassC2SecuredDeferrableFixedRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="9" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_NotesIssued1" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassDSecuredDeferrableFloatingRateLoansDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="10" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_NotesPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassA1SeniorSecuredFloatingRateNotesDue2031Member" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="11" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentInterestRateDuringPeriod" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentNameDomain" xlink:to="pflt_ClassDSecuredDeferrableFloatingRateNotesMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="12" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentPaymentTerms" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="13" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentFrequencyOfPeriodicPayment" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="14" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfOriginalPrincipalAmountPayable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="15" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfPublicOfferingPricePerNotesIssued" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="16" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentMaturityDate" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="17" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtConversionOriginalDebtAmount1" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="18" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentFaceAmount" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="19" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentDescriptionOfVariableRateBasis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="20" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="21" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfPreferredSharesOfSecuritizationIssuer" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="22" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PercentageOfNotesIssuedBySecuritizationIssuer" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="23" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_PreferredSharesOfSecuritizationIssuer" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="24" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="us-gaap_AssetBackedSecuritiesAtCarryingValue" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="25" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DebtInstrumentLineItems" xlink:to="pflt_AssetBackedDebtUnamortizedFees" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommitmentsAndContingenciesDisclosureLineItems" xlink:label="pflt_CommitmentsAndContingenciesDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommitmentsAndContingenciesDisclosureTable" xlink:label="pflt_CommitmentsAndContingenciesDisclosureTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis" xlink:label="srt_RangeAxis"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember" xlink:label="srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember" xlink:label="srt_MaximumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_CommitmentsToFundInvestments" xlink:label="pflt_CommitmentsToFundInvestments"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember" xlink:label="srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_UnfundedCommitments" xlink:label="pflt_UnfundedCommitments"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="pflt_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="pflt_CommitmentsAndContingenciesDisclosureTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="pflt_CommitmentsAndContingenciesDisclosureTable" xlink:to="srt_RangeAxis" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="pflt_CommitmentsToFundInvestments" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="pflt_CommitmentsAndContingenciesDisclosureLineItems" xlink:to="pflt_UnfundedCommitments" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://www.pennantpark.com/20220930/taxonomy/role/Role_DisclosureSubsequentEventsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventLineItems" xlink:label="us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTable" xlink:label="us-gaap_SubsequentEventTable"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentAggregateCost" xlink:label="us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_SubsequentEventTable" priority="2" use="optional"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventLineItems" xlink:to="us-gaap_EquityMethodInvestmentAggregateCost" priority="2" use="optional"/>
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists">
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementAbstract" xlink:label="us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:href="pflt-20220930.xsd#pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" xlink:label="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt"/>
    <link:definitionArc xlink:type="arc" order="0" xbrldt:closed="false" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="pflt_NetChangeInUnrealizedDepreciationAppreciationOnInvestmentsAndDebt" priority="2" use="optional"/>
  </link:definitionLink>
</link:linkbase>
