Source : Webster's Revised Unabridged Dictionary (1913)

Adjuration \Ad`ju*ra"tion\, n. [L. adjuratio, fr. adjurare: cf.
   F. adjuration. See {Adjure}.]
   1. The act of adjuring; a solemn charging on oath, or under
      the penalty of a curse; an earnest appeal.

            What an accusation could not effect, an adjuration
            shall.                                --Bp. Hall.

   2. The form of oath or appeal.

            Persons who . . . made use of prayer and
            adjurations.                          --Addison.

Source : WordNet®

adjuration
     n : a solemn and earnest appeal to someone to do something