present participle of act

(countable, obsolete) An action or deed. / (law) Something done by a party — so called to avoid confusion with the legal senses of deed and action. / Pretending. / (drama) The occupation of an actor.

Abbreviation of Acts.

simple past tense and past participle of act

To act decisively on the basis of information received or deduced. / Το act accordingly to a (usually sublimated) desire or impulse. / To take action against something. / (medicine) To affect something.

plural of acting

(idiomatic) In the process of doing something considered criminal or otherwise wrong; used to emphasize the eye-witness evidence.

Abbreviation of acting. / (grammar) Abbreviation of active. / Abbreviation of actual.

Abbreviation of activities. / Abbreviation of actor. / Abbreviation of actuary.

Ellipsis of Act of Parliament.