Temporarily assuming the duties or authority of another person when they are unable to do their job.

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.

plural of acting

Abbreviation of Acts.

simple past tense and past participle of act

(biblical) Clipping of Acts of the Apostles.

plural of Act.

plural of act

Third-person singular simple present indicative form of act