Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

English definition of “act”

act

verb [I] (DO SOMETHING)   /ækt/
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.
(Definition of act verb (DO SOMETHING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of act

Definitions of “act” in other dictionaries

Word of the Day

limber up

to do gentle exercises to stretch the muscles in order to prepare the body for more active physical exercise

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More