The Collaborative International Dictionary of English v.0.48:

Join \Join\ (join), v. t. [imp. & p. p. Joined (joind); p. pr.
   & vb. n. Joining.] [OE. joinen, joignen, F. joindre, fr. L.
   jungere to yoke, bind together, join; akin to jugum yoke. See
   Yoke, and cf. Conjugal, Junction, Junta.]
   [1913 Webster]
   1. To bring together, literally or figuratively; to place in
      contact; to connect; to couple; to unite; to combine; to
      associate; to add; to append.
      [1913 Webster]

            Woe unto them that join house to house. --Is. v. 8.
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            Held up his left hand, which did flame and burn
            Like twenty torches joined.           --Shak.
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            Thy tuneful voice with numbers join.  --Dryden.
      [1913 Webster]

   2. To associate one's self to; to be or become connected
      with; to league one's self with; to unite with; as, to
      join a party; to join the church.
      [1913 Webster]

            We jointly now to join no other head. --Dryden.
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   3. To unite in marriage.
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            He that joineth his virgin in matrimony. --Wyclif.
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            What, therefore, God hath joined together, let not
            man put asunder.                      --Matt. xix.
                                                  6.
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   4. To enjoin upon; to command. [Obs. & R.]
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            They join them penance, as they call it. --Tyndale.
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   5. To accept, or engage in, as a contest; as, to join
      encounter, battle, issue. --Milton.
      [1913 Webster]

   6. To meet with and accompany; as, we joined them at the
      restaurant.
      [PJC]

   7. To combine with (another person) in performing some
      activity; as, join me in welcoming our new president.
      [PJC]

   To join battle, To join issue. See under Battle,
      Issue.

   Syn: To add; annex; unite; connect; combine; consociate;
        couple; link; append. See Add.
        [1913 Webster]

WordNet (r) 3.0 (2006):

joining
    n 1: the act of bringing two things into contact (especially for
         communication); "the joining of hands around the table";
         "there was a connection via the internet" [syn: joining,
         connection, connexion]