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.