<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 6.6a -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByIndustrySector" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByIndustrySector" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByGeographicRegion" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByGeographicRegion" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByCreditQuality" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByCreditQuality" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByMaturity" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByMaturity" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByAssetCategory" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByAssetCategory" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByOtherCategory" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByOtherCategory" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingsByOtherCategory2" roleURI="http://xbrl.sec.gov/oef/role/HoldingsByOtherCategory2" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#LargestHoldings" roleURI="http://xbrl.sec.gov/oef/role/LargestHoldings" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#ProspectusOnly" roleURI="http://xbrl.sec.gov/rr/role/ProspectusOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#RiskOnly" roleURI="http://xbrl.sec.gov/rr/role/RiskOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#CoregistrantOnly" roleURI="http://xbrl.sec.gov/oef/role/CoregistrantOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#SeriesOnly" roleURI="http://xbrl.sec.gov/oef/role/SeriesOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#ClassOnly" roleURI="http://xbrl.sec.gov/oef/role/ClassOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#PerformanceMeasureOnly" roleURI="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingAssetCategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/HoldingAssetCategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#BroadBasedIndexOnly" roleURI="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#AdditionalIndexOnly" roleURI="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#IndustrySectorOnly" roleURI="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#GeographicRegionOnly" roleURI="http://xbrl.sec.gov/oef/role/GeographicRegionOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#CreditQualityOnly" roleURI="http://xbrl.sec.gov/oef/role/CreditQualityOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#MaturityOnly" roleURI="http://xbrl.sec.gov/oef/role/MaturityOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#Other1CategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#Other2CategoryOnly" roleURI="http://xbrl.sec.gov/oef/role/Other2CategoryOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#LargestHoldingOnly" roleURI="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#SalesLoadOnly" roleURI="http://xbrl.sec.gov/oef/role/SalesLoadOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#HoldingMeasureOnly" roleURI="http://xbrl.sec.gov/oef/role/HoldingMeasureOnly" />
    <link:roleRef xlink:type="simple" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#ValueMeasureOnly" roleURI="http://xbrl.sec.gov/oef/role/ValueMeasureOnly" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/ProspectusOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/RiskOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#oef_AllRisksMember" xlink:label="loc_oefAllRisksMember" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_EquityRiskMember" xlink:label="loc_nlfunEquityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunEquityRiskMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_TreasurySecuritiesRiskMember" xlink:label="loc_nlfunTreasurySecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunTreasurySecuritiesRiskMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateRiskMember" xlink:label="loc_us-gaapInterestRateRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_us-gaapInterestRateRiskMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_SmallAndMidcapitalizationRiskMember" xlink:label="loc_nlfunSmallAndMidcapitalizationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunSmallAndMidcapitalizationRiskMember" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_LargeCapitalizationRiskMember" xlink:label="loc_nlfunLargeCapitalizationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunLargeCapitalizationRiskMember" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_EtfStructureRisksMember" xlink:label="loc_nlfunEtfStructureRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunEtfStructureRisksMember" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_NotIndividuallyRedeemableMember" xlink:label="loc_nlfunNotIndividuallyRedeemableMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunNotIndividuallyRedeemableMember" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_TradingIssuesMember" xlink:label="loc_nlfunTradingIssuesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunTradingIssuesMember" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MarketPriceVarianceRiskMember" xlink:label="loc_nlfunMarketPriceVarianceRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunMarketPriceVarianceRiskMember" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_AuthorizedParticipantRiskMember" xlink:label="loc_nlfunAuthorizedParticipantRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunAuthorizedParticipantRiskMember" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_ManagementRiskMember" xlink:label="loc_nlfunManagementRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunManagementRiskMember" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MarketAndGeopoliticalRiskMember" xlink:label="loc_nlfunMarketAndGeopoliticalRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunMarketAndGeopoliticalRiskMember" xlink:type="arc" order="110" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_PortfolioTurnoverRiskMember" xlink:label="loc_nlfunPortfolioTurnoverRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunPortfolioTurnoverRiskMember" xlink:type="arc" order="120" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_UnderlyingFundRiskMember" xlink:label="loc_nlfunUnderlyingFundRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunUnderlyingFundRiskMember" xlink:type="arc" order="130" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_SecuritiesLendingRiskMember" xlink:label="loc_nlfunSecuritiesLendingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunSecuritiesLendingRiskMember" xlink:type="arc" order="140" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_WhipsawRiskMember" xlink:label="loc_nlfunWhipsawRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunWhipsawRiskMember" xlink:type="arc" order="150" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_ForeignRiskMember" xlink:label="loc_nlfunForeignRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunForeignRiskMember" xlink:type="arc" order="160" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_EmergingMarketRiskMember" xlink:label="loc_nlfunEmergingMarketRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunEmergingMarketRiskMember" xlink:type="arc" order="170" />
      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditRiskMember" xlink:label="loc_us-gaapCreditRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_us-gaapCreditRiskMember" xlink:type="arc" order="180" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_HighYieldBondRiskMember" xlink:label="loc_nlfunHighYieldBondRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunHighYieldBondRiskMember" xlink:type="arc" order="190" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MunicipalBondRiskMember" xlink:label="loc_nlfunMunicipalBondRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunMunicipalBondRiskMember" xlink:type="arc" order="200" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MortgageBackedSecurityRiskMember" xlink:label="loc_nlfunMortgageBackedSecurityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunMortgageBackedSecurityRiskMember" xlink:type="arc" order="210" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_ConvertibleBondRiskMember" xlink:label="loc_nlfunConvertibleBondRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunConvertibleBondRiskMember" xlink:type="arc" order="220" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_BankLoanRiskMember" xlink:label="loc_nlfunBankLoanRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunBankLoanRiskMember" xlink:type="arc" order="230" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_PreferredSecurityRiskMember" xlink:label="loc_nlfunPreferredSecurityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_nlfunPreferredSecurityRiskMember" xlink:type="arc" order="240" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CoregistrantOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SeriesOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_S000085657Member" xlink:label="loc_nlfunS000085657Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_nlfunS000085657Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_S000085659Member" xlink:label="loc_nlfunS000085659Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_nlfunS000085659Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_S000085656Member" xlink:label="loc_nlfunS000085656Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_nlfunS000085656Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_S000085658Member" xlink:label="loc_nlfunS000085658Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_nlfunS000085658Member" xlink:type="arc" order="30" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ClassOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#oef_ShareClassDomain" xlink:label="loc_oefShareClassDomain" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_C000250991Member" xlink:label="loc_nlfunC000250991Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_nlfunC000250991Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_C000250993Member" xlink:label="loc_nlfunC000250993Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_nlfunC000250993Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_C000250990Member" xlink:label="loc_nlfunC000250990Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_nlfunC000250990Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_C000250992Member" xlink:label="loc_nlfunC000250992Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_nlfunC000250992Member" xlink:type="arc" order="30" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/rr/role/PerformanceMeasureOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2026/oef-2026.xsd#oef_PerformanceMeasureDomain" xlink:label="loc_oefPerformanceMeasureDomain" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MorningstarUSMarketTRUSDReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:label="loc_nlfunMorningstarUSMarketTRUSDReflectsNoDeductionForFeesExpenseOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_nlfunMorningstarUSMarketTRUSDReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_MorningstarGlobalMarketsExUSNRIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:label="loc_nlfunMorningstarGlobalMarketsExUSNRIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_nlfunMorningstarGlobalMarketsExUSNRIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="nlfun-20261027.xsd#nlfun_BloombergUSAggregateBondIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:label="loc_nlfunBloombergUSAggregateBondIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_nlfunBloombergUSAggregateBondIndexReflectsNoDeductionForFeesExpenseOrTaxesMember" xlink:type="arc" order="20" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/HoldingAssetCategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/BroadBasedIndexOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/AdditionalIndexOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/MaturityOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other1CategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/Other2CategoryOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/LargestHoldingOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/SalesLoadOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/HoldingMeasureOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/ValueMeasureOnly" />
</link:linkbase>
