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.
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         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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