The Collaborative International Dictionary of English v.0.48:

Conjoin \Con*join\, v. t. [imp. & p. p. Conjoined; p. pr. &
   vb. n. Conjoining.] [F. conjoindre, fr. L. conjungere,
   -junctum; con- + jungere to join. See Join, and cf.
   Conjugate, Conjunction.]
   To join together; to unite.
   [1913 Webster]

         The English army, that divided was
         Into two parties, is now conjoined in one. --Shak.
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         If either of you know any inward impediment why you
         should not be conjoined.                 --Shak.
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         Let that which he learns next be nearly conjoined with
         what he knows already.                   --Locke.
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The Collaborative International Dictionary of English v.0.48:

Conjoin \Con*join"\, v. i.
   To unite; to join; to league. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

conjoin
    v 1: make contact or come together; "The two roads join here"
         [syn: join, conjoin] [ant: disjoin, disjoint]
    2: take in marriage [syn: marry, get married, wed,
       conjoin, hook up with, get hitched with, espouse]