Act Act, v. t. [imp. & p. p. Acted; p. pr. & vb. n. Acting.] [L. actus, p. p. of agere to drive, lead, do; but influenced by E. act, n.] 1. To move to action; to actuate; to animate. [Obs.] Self-love, the spring of motion, acts the soul. --Pope. 2. To perform; to execute; to do. [Archaic] That we act our temporal affairs with a desire no greater than our necessity. --Jer. Taylor. Industry doth beget by producing good habits, and facility of acting things expedient for us to do. --Barrow. Uplifted hands that at convenient times Could act extortion and the worst of crimes. --Cowper. 3. To perform, as an actor; to represent dramatically on the stage. 4. To assume the office or character of; to play; to personate; as, to act the hero. 5. To feign or counterfeit; to simulate. With acted fear the villain thus pursued. --Dryden. To act a part, to sustain the part of one of the characters in a play; hence, to simulate; to dissemble. To act the part of, to take the character of; to fulfill the duties of., Acting Act"ing, a. 1. Operating in any way. 2. Doing duty for another; officiating; as, an acting superintendent.