<?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="kurv-20260928.xsd#kurv_AmazonInvestingRiskMember" xlink:label="loc_kurvAmazonInvestingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAmazonInvestingRiskMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_AmazonRiskMember" xlink:label="loc_kurvAmazonRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAmazonRiskMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_BusinessRisksMember" xlink:label="loc_kurvBusinessRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvBusinessRisksMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_LegalAndRegulatoryComplianceRisksMember" xlink:label="loc_kurvLegalAndRegulatoryComplianceRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvLegalAndRegulatoryComplianceRisksMember" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_FinancialRisksMember" xlink:label="loc_kurvFinancialRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvFinancialRisksMember" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_DerivativesRiskMember" xlink:label="loc_kurvDerivativesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvDerivativesRiskMember" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_OptionsRiskMember" xlink:label="loc_kurvOptionsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvOptionsRiskMember" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_FlexOptionsRiskMember" xlink:label="loc_kurvFlexOptionsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvFlexOptionsRiskMember" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CallRiskMember" xlink:label="loc_kurvCallRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCallRiskMember" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CreditRisksMember" xlink:label="loc_kurvCreditRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCreditRisksMember" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CurrencyRiskMember" xlink:label="loc_kurvCurrencyRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCurrencyRiskMember" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_EmergingMarketsRiskMember" xlink:label="loc_kurvEmergingMarketsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvEmergingMarketsRiskMember" xlink:type="arc" order="110" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_EquityRiskMember" xlink:label="loc_kurvEquityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvEquityRiskMember" xlink:type="arc" order="120" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ExchangeTradedFundETFStructureRiskMember" xlink:label="loc_kurvExchangeTradedFundETFStructureRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvExchangeTradedFundETFStructureRiskMember" xlink:type="arc" order="130" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MarketPriceVarianceRiskMember" xlink:label="loc_kurvMarketPriceVarianceRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMarketPriceVarianceRiskMember" xlink:type="arc" order="140" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_AuthorizedParticipantRiskMember" xlink:label="loc_kurvAuthorizedParticipantRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAuthorizedParticipantRiskMember" xlink:type="arc" order="150" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_TradingIssuesMember" xlink:label="loc_kurvTradingIssuesMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvTradingIssuesMember" xlink:type="arc" order="160" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_AbsenceOfActiveTradingMarketRiskMember" xlink:label="loc_kurvAbsenceOfActiveTradingMarketRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAbsenceOfActiveTradingMarketRiskMember" xlink:type="arc" order="170" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ForeignNonUSInvestmentRiskMember" xlink:label="loc_kurvForeignNonUSInvestmentRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvForeignNonUSInvestmentRiskMember" xlink:type="arc" order="180" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_HighYieldRiskMember" xlink:label="loc_kurvHighYieldRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvHighYieldRiskMember" xlink:type="arc" order="190" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_InterestRateRisksMember" xlink:label="loc_kurvInterestRateRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvInterestRateRisksMember" xlink:type="arc" order="200" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_InvestinginOtherInvestmentCompaniesRiskMember" xlink:label="loc_kurvInvestinginOtherInvestmentCompaniesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvInvestinginOtherInvestmentCompaniesRiskMember" xlink:type="arc" order="210" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_LeveragingRiskMember" xlink:label="loc_kurvLeveragingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvLeveragingRiskMember" xlink:type="arc" order="220" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_LiquidityRiskMember" xlink:label="loc_kurvLiquidityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvLiquidityRiskMember" xlink:type="arc" order="230" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ManagementRiskMember" xlink:label="loc_kurvManagementRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvManagementRiskMember" xlink:type="arc" order="240" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MarketRiskMember" xlink:label="loc_kurvMarketRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMarketRiskMember" xlink:type="arc" order="250" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MortgageRelatedAndOtherAssetBackedSecuritiesRiskMember" xlink:label="loc_kurvMortgageRelatedAndOtherAssetBackedSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMortgageRelatedAndOtherAssetBackedSecuritiesRiskMember" xlink:type="arc" order="260" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_NavErosionRiskDueToDistributionsMember" xlink:label="loc_kurvNavErosionRiskDueToDistributionsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvNavErosionRiskDueToDistributionsMember" xlink:type="arc" order="270" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SecuritiesLendingRiskMember" xlink:label="loc_kurvSecuritiesLendingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSecuritiesLendingRiskMember" xlink:type="arc" order="280" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ShortExposureRiskMember" xlink:label="loc_kurvShortExposureRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvShortExposureRiskMember" xlink:type="arc" order="290" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SmallFundRiskMember" xlink:label="loc_kurvSmallFundRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSmallFundRiskMember" xlink:type="arc" order="300" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SovereignDebtRiskMember" xlink:label="loc_kurvSovereignDebtRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSovereignDebtRiskMember" xlink:type="arc" order="310" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_TaxRiskMember" xlink:label="loc_kurvTaxRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvTaxRiskMember" xlink:type="arc" order="320" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_AppleRiskMember" xlink:label="loc_kurvAppleRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAppleRiskMember" xlink:type="arc" order="330" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_GoogleRiskMember" xlink:label="loc_kurvGoogleRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvGoogleRiskMember" xlink:type="arc" order="340" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MicrosoftRiskMember" xlink:label="loc_kurvMicrosoftRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMicrosoftRiskMember" xlink:type="arc" order="350" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_NetflixRiskMember" xlink:label="loc_kurvNetflixRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvNetflixRiskMember" xlink:type="arc" order="360" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_TeslaRiskMember" xlink:label="loc_kurvTeslaRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvTeslaRiskMember" xlink:type="arc" order="370" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_GoldRiskMember" xlink:label="loc_kurvGoldRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvGoldRiskMember" xlink:type="arc" order="380" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ExchangeTradedProductETPRiskMember" xlink:label="loc_kurvExchangeTradedProductETPRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvExchangeTradedProductETPRiskMember" xlink:type="arc" order="390" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_InvestingInOtherInvestmentCompaniesRisksMember" xlink:label="loc_kurvInvestingInOtherInvestmentCompaniesRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvInvestingInOtherInvestmentCompaniesRisksMember" xlink:type="arc" order="400" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_WhollyownedSubsidiaryRiskMember" xlink:label="loc_kurvWhollyownedSubsidiaryRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvWhollyownedSubsidiaryRiskMember" xlink:type="arc" order="410" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SilverRiskMember" xlink:label="loc_kurvSilverRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSilverRiskMember" xlink:type="arc" order="420" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_PlatinumRiskMember" xlink:label="loc_kurvPlatinumRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvPlatinumRiskMember" xlink:type="arc" order="430" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_NewFundRiskMember" xlink:label="loc_kurvNewFundRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvNewFundRiskMember" xlink:type="arc" order="440" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CopperRiskMember" xlink:label="loc_kurvCopperRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCopperRiskMember" xlink:type="arc" order="450" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CopperMiningCompaniesRiskMember" xlink:label="loc_kurvCopperMiningCompaniesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCopperMiningCompaniesRiskMember" xlink:type="arc" order="460" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_TechnologySectorRiskMember" xlink:label="loc_kurvTechnologySectorRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvTechnologySectorRiskMember" xlink:type="arc" order="470" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MarketRisksMember" xlink:label="loc_kurvMarketRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMarketRisksMember" xlink:type="arc" order="480" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_UnderlyingSecurityRiskMember" xlink:label="loc_kurvUnderlyingSecurityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvUnderlyingSecurityRiskMember" xlink:type="arc" order="490" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_DistributionRiskMember" xlink:label="loc_kurvDistributionRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvDistributionRiskMember" xlink:type="arc" order="500" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SingleIssuerRiskMember" xlink:label="loc_kurvSingleIssuerRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSingleIssuerRiskMember" xlink:type="arc" order="510" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_HighPortfolioTurnoverRiskMember" xlink:label="loc_kurvHighPortfolioTurnoverRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvHighPortfolioTurnoverRiskMember" xlink:type="arc" order="520" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_PreciousMetalRiskMember" xlink:label="loc_kurvPreciousMetalRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvPreciousMetalRiskMember" xlink:type="arc" order="530" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_InflationRiskMember" xlink:label="loc_kurvInflationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvInflationRiskMember" xlink:type="arc" order="540" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_OperationalRiskMember" xlink:label="loc_kurvOperationalRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvOperationalRiskMember" xlink:type="arc" order="550" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_InvestingInETFsRisksMember" xlink:label="loc_kurvInvestingInETFsRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvInvestingInETFsRisksMember" xlink:type="arc" order="560" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ETPRisksMember" xlink:label="loc_kurvETPRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvETPRisksMember" xlink:type="arc" order="570" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ETFRisksMember" xlink:label="loc_kurvETFRisksMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvETFRisksMember" xlink:type="arc" order="580" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_AuthorizedParticipantsMarketMakersAndLiquidityProvidersConcentrationRiskMember" xlink:label="loc_kurvAuthorizedParticipantsMarketMakersAndLiquidityProvidersConcentrationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvAuthorizedParticipantsMarketMakersAndLiquidityProvidersConcentrationRiskMember" xlink:type="arc" order="590" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CostsOfBuyingOrSellingSharesRiskMember" xlink:label="loc_kurvCostsOfBuyingOrSellingSharesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCostsOfBuyingOrSellingSharesRiskMember" xlink:type="arc" order="600" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_SharesMayTradeAtPricesOtherThanNAVRiskMember" xlink:label="loc_kurvSharesMayTradeAtPricesOtherThanNAVRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvSharesMayTradeAtPricesOtherThanNAVRiskMember" xlink:type="arc" order="610" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_TradingRiskMember" xlink:label="loc_kurvTradingRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvTradingRiskMember" xlink:type="arc" order="620" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CallWritingStrategyRiskMember" xlink:label="loc_kurvCallWritingStrategyRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCallWritingStrategyRiskMember" xlink:type="arc" order="630" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_CounterpartyRiskMember" xlink:label="loc_kurvCounterpartyRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvCounterpartyRiskMember" xlink:type="arc" order="640" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_FixedIncomeSecuritiesRiskMember" xlink:label="loc_kurvFixedIncomeSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvFixedIncomeSecuritiesRiskMember" xlink:type="arc" order="650" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ForeignNonUSSecuritiesRiskMember" xlink:label="loc_kurvForeignNonUSSecuritiesRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvForeignNonUSSecuritiesRiskMember" xlink:type="arc" order="660" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_ImpliedVolatilityRiskMember" xlink:label="loc_kurvImpliedVolatilityRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvImpliedVolatilityRiskMember" xlink:type="arc" order="670" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_MoneyMarketInstrumentRiskMember" xlink:label="loc_kurvMoneyMarketInstrumentRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvMoneyMarketInstrumentRiskMember" xlink:type="arc" order="680" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_PriceParticipationRiskMember" xlink:label="loc_kurvPriceParticipationRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvPriceParticipationRiskMember" xlink:type="arc" order="690" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_USGovernmentAndUSAgencyObligationsRiskMember" xlink:label="loc_kurvUSGovernmentAndUSAgencyObligationsRiskMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefAllRisksMember" xlink:to="loc_kurvUSGovernmentAndUSAgencyObligationsRiskMember" xlink:type="arc" order="700" />
    </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="kurv-20260928.xsd#kurv_S000086184Member" xlink:label="loc_kurvS000086184Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086184Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000086185Member" xlink:label="loc_kurvS000086185Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086185Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000086186Member" xlink:label="loc_kurvS000086186Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086186Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000086187Member" xlink:label="loc_kurvS000086187Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086187Member" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000086188Member" xlink:label="loc_kurvS000086188Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086188Member" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000086189Member" xlink:label="loc_kurvS000086189Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000086189Member" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000092498Member" xlink:label="loc_kurvS000092498Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000092498Member" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000092500Member" xlink:label="loc_kurvS000092500Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000092500Member" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000092499Member" xlink:label="loc_kurvS000092499Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000092499Member" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000101226Member" xlink:label="loc_kurvS000101226Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000101226Member" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000085571Member" xlink:label="loc_kurvS000085571Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000085571Member" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_S000095808Member" xlink:label="loc_kurvS000095808Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_kurvS000095808Member" xlink:type="arc" order="110" />
    </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="kurv-20260928.xsd#kurv_C000251590Member" xlink:label="loc_kurvC000251590Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251590Member" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000251591Member" xlink:label="loc_kurvC000251591Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251591Member" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000251592Member" xlink:label="loc_kurvC000251592Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251592Member" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000251593Member" xlink:label="loc_kurvC000251593Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251593Member" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000251594Member" xlink:label="loc_kurvC000251594Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251594Member" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000251595Member" xlink:label="loc_kurvC000251595Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000251595Member" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000260529Member" xlink:label="loc_kurvC000260529Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000260529Member" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000260531Member" xlink:label="loc_kurvC000260531Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000260531Member" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000260530Member" xlink:label="loc_kurvC000260530Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000260530Member" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000271320Member" xlink:label="loc_kurvC000271320Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000271320Member" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000250868Member" xlink:label="loc_kurvC000250868Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000250868Member" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_C000264590Member" xlink:label="loc_kurvC000264590Member" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefShareClassDomain" xlink:to="loc_kurvC000264590Member" xlink:type="arc" order="110" />
    </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="kurv-20260928.xsd#kurv_SAndP500TotalReturnIndexMember" xlink:label="loc_kurvSAndP500TotalReturnIndexMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_kurvSAndP500TotalReturnIndexMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="kurv-20260928.xsd#kurv_NASDAQ100TotalReturnIndexMember" xlink:label="loc_kurvNASDAQ100TotalReturnIndexMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_oefPerformanceMeasureDomain" xlink:to="loc_kurvNASDAQ100TotalReturnIndexMember" xlink:type="arc" order="10" />
    </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>
