Source : Webster's Revised Unabridged Dictionary (1913)

Betroth \Be*troth"\, v. t. [imp. & p. p. {Betrothed}; p. pr. &
   vb. n. {Betrothing}.] [Pref. be- + troth, i. e., truth. See
   {Truth}.]
   1. To contract to any one for a marriage; to engage or
      promise in order to marriage; to affiance; -- used esp. of
      a woman.

            He, in the first flower of my freshest age,
            Betrothed me unto the only heir.      --Spenser.

            Ay, and we are betrothed.             --Shak.

   2. To promise to take (as a future spouse); to plight one's
      troth to.

            What man is there that hath betrothed a wife, and
            hath not taken her?                   --Deut. xx. 7.

   3. To nominate to a bishopric, in order to consecration.
      --Ayliffe.

Source : WordNet®

betrothed
     adj : pledged to be married; "the engaged couple" [syn: {affianced},
            {bespoken}, {engaged}, {pledged}]
     n : the person to whom you are engaged