The Collaborative International Dictionary of English v.0.48:

paired \paired\ (p[^a]rd), adj.
   1. Organized into compatible pairs; -- used of gloves, socks,
      etc. See pair[1], v. t.

   Syn: mated.
        [WordNet 1.5]

   2. (Botany) Growing in pairs on either side of a stem; -- of
      leaves etc. alternate

   Syn: opposite.
        [WordNet 1.5]

   3. Mated sexually.
      [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Pair \Pair\, v. i. [imp. & p. p. Paired; p. pr. & vb. n.
   Pairing.]
   1. To be joined in pairs; to couple; to mate, as for
      breeding.
      [1913 Webster]

   2. To suit; to fit, as a counterpart.
      [1913 Webster]

            My heart was made to fit and pair with thine.
                                                  --Rowe.
      [1913 Webster]

   3. Same as To pair off. See phrase below.
      [1913 Webster]

   To pair off, to separate from a group in pairs or couples;
      specif. (Parliamentary Cant), to agree with one of the
      opposite party or opinion to abstain from voting on
      specified questions or issues. See Pair, n., 6.
      [1913 Webster]

WordNet (r) 3.0 (2006):

paired
    adj 1: used of gloves, socks, etc. [syn: mated, paired]
    2: of leaves etc; growing in pairs on either side of a stem;
       "opposite leaves" [syn: opposite, paired] [ant:
       alternate]
    3: mated sexually