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appetence (n.)[appetence 词源字典]: "strong desire," c. 1600, from French appétence "desire," from Latin appetentia "longing after something," noun of state from appetentem (nominative appetens), present participle of appetere, from ad "to" (see ad-) + petere "to seek, request" (see petition (n.)).[appetence etymology, appetence origin, 英语词源]
appetency: "A longing or desire", Early 17th century: from Latin appetentia, from appetere 'seek after' (see appetite).