act

(noun): Something done, a deed.
(noun): Actuality.
(noun): Something done once and for all, as distinguished from a work.
(noun): A product of a legislative body, a statute.
(noun): The process of doing something.
(noun): A formal or official record of something done.
(noun): A division of a theatrical performance.
(noun): A performer or performers in a show.
(noun): Any organized activity.
(noun): A display of behaviour.
(noun): A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student.
(noun): A display of behaviour meant to deceive.
(verb): To do something.
(verb): To do (something); to perform.
(verb): To perform a theatrical role.
(verb): Of a play: to be acted out (well or badly).
(verb): To behave in a certain manner for an indefinite length of time.
(verb): To convey an appearance of being.
(verb): To do something that causes a change binding on the doer.
(verb): (construed with on or upon) To have an effect (on).
(verb): To play (a role).
(verb): To feign.
(verb): (construed with on or upon, of a group) To map via a homomorphism to a group of automorphisms (of).
(verb): To move to action; to actuate; to animate.