Source : Webster's Revised Unabridged Dictionary (1913)

Affiance \Af*fi"ance\, n. [OE. afiaunce trust, confidence, OF.
   afiance, fr. afier to trust, fr. LL. affidare to trust; ad +
   fidare to trust, fr. L. fides faith. See {Faith}, and cf.
   {Affidavit}, {Affy}, {Confidence}.]
   1. Plighted faith; marriage contract or promise.

   2. Trust; reliance; faith; confidence.

            Such feelings promptly yielded to his habitual
            affiance in the divine love.          --Sir J.
                                                  Stephen.

            Lancelot, my Lancelot, thou in whom I have Most joy
            and most affiance.                    --Tennyson.

Affiance \Af*fi"ance\, v. t. [imp. ? p. p. {Affianced}; p. pr. ?
   vb. n. {Affiancing}.] [Cf. OF. afiancier, fr. afiance.]
   1. To betroth; to pledge one's faith to for marriage, or
      solemnly promise (one's self or another) in marriage.

            To me, sad maid, he was affianced.    --Spenser.

   2. To assure by promise. [Obs.] --Pope.

Source : WordNet®

affiance
     v : give to in marriage [syn: {betroth}, {engage}, {plight}]