Engaged to be married; having made a formal promise or agreement to marry.
From French 'fiancé,' the past participle of 'fiancer' (to betroth), which derives from Latin 'fidare.' The English adjective form directly borrows the French participle structure. In French, 'fiancé' (masculine) and 'fiancée' (feminine) are used as both adjectives and nouns.
English borrowed 'fiancé' and 'fiancée' from French and never looked back—we use them instead of our own 'betrothed,' which shows how a more romantic-sounding foreign word can displace a perfectly good English term.
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