The Collaborative International Dictionary of English v.0.48:

committed \committed\ adj.
   1. Bound or obligated, as under a pledge to a particular
      cause, action, or attitude. Opposite of uncommitted.

   Note: [Narrower terms: bound up, involved, wrapped up;
         dedicated, devoted; pledged, sworn]
         [WordNet 1.5]

   2. Associated in an exclusive sexual relationship; also
      called attached. Opposite of unattached.

   Note: [Narrower terms: affianced, bespoken, betrothed,
         engaged, pledged, promised(predicate); married]
         [Also See: loving.]

   Syn: attached.
        [WordNet 1.5]

   3. Consigned involuntarily to custody, as in a prison or
      mental institution.
      [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

affiance \af*fi"ance\, v. t. [imp. & p. p. affianced
   ([a^]f*f[imac]"anst); p. pr. & vb. n. affiancing
   ([a^]f*f[imac]"an*s[i^]ng).] [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.
      [1913 Webster]

            To me, sad maid, he was affianced.    --Spenser.
      [1913 Webster]

   2. To assure by promise. [Obs.] --Pope.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "affianced":
   assured, betrothed, bound, bride-to-be, committed, compromised,
   contracted, engaged, fiance, fiancee, future, guaranteed, intended,
   obligated, pledged, plighted, promised, sworn, underwritten,
   warranted



The Devil's Dictionary (1881-1906):

AFFIANCED, pp.  Fitted with an ankle-ring for the ball-and-chain.