Etymology
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affiance (v.)

1520s, "to promise," from Old French afiancier "to pledge, promise, give one's word," from afiance (n.) "confidence, trust," from afier "to trust," from Late Latin affidare, from ad "to" (see ad-) + fidare "to trust," from fidus "faithful" (from PIE root *bheidh- "to trust, confide, persuade").

From mid-16c. especially "to promise in marriage." The earlier form of the word was affy (Middle English affien "to trust, have faith; have faith in" c. 1300), from Old French afier. Related: Affianced; affiancing.

updated on September 15, 2022

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Definitions of affiance from WordNet

affiance (v.)
give to in marriage;
Synonyms: betroth / engage / plight
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.