The Collaborative International Dictionary of English v.0.48:

Conjure \Con*jure"\ (k[o^]n*j[=u]r"), v. t. [imp. & p. p.
   Conjured (-j[=u]rd"); p. pr. & vb. n. Conjuring.] [F.
   conjurer, fr. L. conjurare to swear together, to conspire;
   con- + jurare to swear. See Jury.]
   To call on or summon by a sacred name or in solemn manner; to
   implore earnestly; to adjure.
   [1913 Webster]

         I conjure you, let him know,
         Whate'er was done against him, Cato did it. --Addison.
   [1913 Webster]