act - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “act”

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act

verb  us   /ækt/

act verb (DO SOMETHING)

[I] to do something for a particular purpose or in a particular way: [+ to infinitive] The president acted quickly to bring federal aid to areas damaged by flooding. She acted responsibly. He acted as if he’d never seen me before. She acted as (= performed in the position of) a tour guide for the group. He said he was acting on (= doing something as a result of) the advice of his lawyer.

act verb (PERFORM)

[I/T] to perform in a movie, play, or television show: [T] He acts the part of a small-town lawyer. [I] She has acted in lots of television sitcoms.
Phrasal verbs

act

noun [C]  us   /ækt/

act noun [C] (LAW)

law a law made by Congress or another legislature: an act of Congress

act noun [C] (PERFORM)

one of a set of short performances that are parts of a show, or the person or group who performs one of these parts: a circus act fig. His story is just an act (= is pretended and not sincere). An act is also one of the main parts of a play or opera: The play is presented in three acts.
(Definition of act from the Cambridge Academic Content Dictionary © Cambridge University Press)
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