Available Definitions:
1) a. - Operating in any way.
2) a. - Doing duty for another; officiating; as, an acting superintendent.
3) n. - A formal solemn writing, expressing that something has been done.
4) n. - A performance of part of a play; one of the principal divisions of a play or dramatic work in which a certain definite part of the action is completed.
5) n. - A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student.
6) n. - A state of reality or real existence as opposed to a possibility or possible existence.
7) n. - Process of doing; action. In act, in the very doing; on the point of (doing).
8) v. t. - To move to action; to actuate; to animate.
9) v. t. - To perform; to execute; to do.
10) v. t. - To perform, as an actor; to represent dramatically on the stage.
11) v. t. - To assume the office or character of; to play; to personate; as, to act the hero.
12) v. t. - To feign or counterfeit; to simulate.
13) v. i. - To exert power; to produce an effect; as, the stomach acts upon food.
14) v. i. - 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.
15) v. i. - 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.
16) v. i. - To perform on the stage; to represent a character.