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From The Collaborative International Dictionary of English v.0.48:
Ventriloquism \Ven*tril"o*quism\, n. [See Ventriloquous.] The act, art, or practice of speaking in such a manner that the voice appears to come, not from the person speaking, but from some other source, as from a dummy held by the ventriloquist, from the opposite side of the room, from the cellar, etc. [1913 Webster]