Definitions
1.verbTo do something."If you don't act soon, you will be in trouble."
2.verbTo do (something); to perform.
3.verbTo perform a theatrical role."I started acting at the age of eleven in my local theatre."
4.verbOf a play: to be acted out (well or badly).
5.verbTo behave in a certain manner for an indefinite length of time."A dog which acts aggressively is likely to bite."
6.verbTo convey an appearance of being."He acted unconcerned so the others wouldn't worry."
7.verbTo do something that causes a change binding on the doer."act on behalf of John"
8.verb(construed with on or upon) To have an effect (on)."Gravitational force acts on heavy bodies."
9.verbTo play (a role)."He's been acting Shakespearean leads since he was twelve."
10.verbTo feign."He acted the angry parent, but was secretly amused."
11.verb(construed with on or upon, of a group) To map via a homomorphism to a group of automorphisms (of)."This group acts on the circle, so it can't be left-orderable!"
12.verbTo move to action; to actuate; to animate.
13.nounAn action or deed.
14.nounSomething done by a party — so called to avoid confusion with the legal senses of deed and action.
15.nounPretending.
16.nounThe occupation of an actor.
17.adjectiveTemporarily assuming the duties or authority of another person when they are unable to do their job."Acting President of the United States is a temporary office in the government of the United States."