EUC en · NOUN Meanings (abbreviation, alt-of) Abbreviation of electric unicycle. alt of electric unicycle (abbreviation, alt-of) Abbreviation of excellent used condition (describing an item for sale, especially clothing, which is not new—it has been used—but is in excellent condition). alt of excellent used condition (abbreviation, alt-of) Abbreviation of end-user computing. alt of end-user computing (abbreviation, alt-of) Abbreviation of European Union Committee. alt of European Union Committee (abbreviation, alt-of) Abbreviation of end-user certificate. alt of end-user certificate (abbreviation, alt-of) Abbreviation of Emergency Unemployment Compensation. alt of Emergency Unemployment Compensation