The Collaborative International Dictionary of English v.0.48:

Convoke \Con*voke"\, v. t. [imp. & p. p. Convoked; p. pr. &
   vb. n. Convoking.] [L. convocare: cf. F. convoquer. See
   Convocate.]
   To call together; to summon to meet; to assemble by summons.
   [1913 Webster]

         There remained no resource but the dreadful one of
         convoking a parliament.                  --palfrey.

   Syn: To summon; assemble; convene. See Call.
        [1913 Webster]

WordNet (r) 3.0 (2006):

convoke
    v 1: call together; "The students were convened in the
         auditorium" [syn: convoke, convene]