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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Middle English affien (“to have faith, trust”), from Anglo-Norman afier, affier, affyer, Middle French afier, affier, affyer, and Old French afier (“to agree to marry; to believe, trust; to assure, promise; to confide in; to pledge, swear”), from Late Latin affidare (“to betroth; to pledge faith”), from Latin af- (a variant of ad- (intensifying prefix)) + Vulgar Latin *fīdāre (“to trust”) (from Latin fidēre, the present active infinitive of fīdō (“to put confidence in, trust; to rely upon”), ultimately from Proto-Indo-European *bʰeydʰ- (“to convince; to trust”)).
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Classic usage
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