affiance v. + Add to list af·fi·ance Archaic SynonymsEtymology Synonyms betrothengageplightOriginLATfīdere→LA-MEDaffīdāre→FRMaffiance→ENaffiance From Middle French affiance, from affier (from Medieval Latin affīdāre, from *fīdāre, from Latin fīdere) + -ance.