Act, v. i.
 1. To exert power; to produce an effect; as, the stomach acts upon food.
 2. To perform actions; to fulfill functions; to put forth energy; to move, as opposed to remaining at rest; to carry into effect a determination of the will.
    He hangs between, in doubt to act or rest.   --Pope.
 3. To behave or conduct, as in morals, private duties, or public offices; to bear or deport one's self; as, we know not why he has acted so.
 4. To perform on the stage; to represent a character.
    To show the world how Garrick did not act.   --Cowper.
 To act as or To act for, to do the work of; to serve as.
 To act on, to regulate one's conduct according to.
 To act up to, to equal in action; to fulfill in practice; as, he has acted up to his engagement or his advantages.

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