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Actor Ac"tor, n. [L. actor, fr. agere to act.] 1. One who acts, or takes part in any affair; a doer. 2. A theatrical performer; a stageplayer. After a well graced actor leaves the stage. --Shak. 3. (Law) (a) An advocate or proctor in civil courts or causes. --Jacobs. (b) One who institutes a suit; plaintiff or complainant.