Source : Webster's Revised Unabridged Dictionary (1913)

Conjuration \Con`ju*ra"tion\, n. [L. conjuratio, cf. F.
   conjuration.]
   1. The act of calling or summoning by a sacred name, or in
      solemn manner; the act of binding by an oath; an earnest
      entreaty; adjuration.

            We charge you, in the name of God, take heed; . . .
            Under this conjuration speak, my lord. --Shak.

   2. The act or process of invoking supernatural aid by the use
      of a magical form of words; the practice of magic arts;
      incantation; enchantment.

            Pretended conjurations and prophecies of that event.
                                                  --Hallam.

   3. A league for a criminal purpose; conspiracy. [Obs.] ``The
      conjuration of Catiline.'' --Sir T. Elyot.

Source : WordNet®

conjuration
     n 1: a ritual recitation of words or sounds believed to have a
          magical effect [syn: {incantation}]
     2: calling up a spirit or devil [syn: {conjuring}, {conjury}, {invocation}]
     3: an illusory feat; considered magical by naive observers
        [syn: {magic trick}, {conjuring trick}, {trick}, {magic},
        {legerdemain}, {illusion}, {deception}]