The Collaborative International Dictionary of English v.0.48:

Adjure \Ad*jure"\, v. t. [imp. & p. p. Adjured; p. pr. & vb.
   n. Adjuring]. [L. adjurare, adjurdium, to swear to; later,
   to adjure: cf. F. adjurer. See Jury.]
   To charge, bind, or command, solemnly, as if under oath, or
   under the penalty of a curse; to appeal to in the most solemn
   or impressive manner; to entreat earnestly.
   [1913 Webster]

         Joshua adjured them at that time, saying, Cursed be the
         man before the Lord, that riseth up and buildeth this
         city Jericho.                            --Josh. vi.
                                                  26.
   [1913 Webster]

         The high priest . . . said . . . I adjure thee by the
         living God, that thou tell us whether thou be the
         Christ.                                  --Matt. xxvi.
                                                  63.
   [1913 Webster]

         The commissioners adjured them not to let pass so
         favorable an opportunity of securing their liberties.
                                                  --Marshall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

adjure
    v 1: ask for or request earnestly; "The prophet bid all people
         to become good persons" [syn: bid, beseech, entreat,
         adjure, press, conjure]
    2: command solemnly

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "adjure":
   administer an oath, appeal, appeal to, beg, beseech, call for help,
   call on, call upon, clamor for, conjure, crave, cry for, cry on,
   cry to, entreat, impetrate, implore, imprecate, invoke, kneel to,
   obtest, plead, plead for, pray, put under oath, put upon oath,
   run to, supplicate, swear, swear in