The Collaborative International Dictionary of English v.0.48:

Convene \Con*vene"\, v. i. [imp. & p. p. Convened; p. pr. &
   vb. n. Convenong.] [L. convenire; con- + venire to come:
   cf. F. convenir to agree, to be fitting, OF. also, to
   assemble. See Come, and cf. Covenant.]
   1. To come together; to meet; to unite. [R.]
      [1913 Webster]

            In shortsighted men . . . the rays converge and
            convene in the eyes before they come at the bottom.
                                                  --Sir I.
                                                  Newton.
      [1913 Webster]

   2. To come together, as in one body or for a public purpose;
      to meet; to assemble. --Locke.
      [1913 Webster]

            The Parliament of Scotland now convened. --Sir R.
                                                  Baker.
      [1913 Webster]

            Faint, underneath, the household fowls convene.
                                                  --Thomson.

   Syn: To meet; to assemble; to congregate; to collect; to
        unite.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Convene \Con*vene"\, v. t.
   1. To cause to assemble; to call together; to convoke.
      [1913 Webster]

            And now the almighty father of the gods
            Convenes a council in the blest abodes. --Pope.
      [1913 Webster]

   2. To summon judicially to meet or appear.
      [1913 Webster]

            By the papal canon law, clerks . . . can not be
            convened before any but an ecclesiastical judge.
                                                  --Ayliffe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

convene
    v 1: meet formally; "The council convened last week"
    2: call together; "The students were convened in the auditorium"
       [syn: convoke, convene]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "convene":
   assemble, bid come, call, call away, call back, call for,
   call forth, call in, call out, call together, call up, cite,
   conjure, conjure up, convoke, demand, evoke, hold a meeting,
   hold a session, indent, invoke, meet, muster, muster up, open,
   order up, page, preconize, recall, requisition, send after,
   send for, serve, sit, subpoena, summon, summon forth, summon up,
   summons



Bouvier's Law Dictionary, Revised 6th Ed (1856):

CONVENE, civil law. This is a technical term, signifying to bring an action.