Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “act”

act

verb [I]     /ækt/
to do something with the intention of achieving a particular result: act to do sth Engineers will need to act quickly to repair the damaged pipes.act quickly/swiftly/now Anyone who wants a fixed-rate deal should act now.act decisively/improperly/responsibly It is now time for management to act decisively.act against/in sb's interests There were claims that the management was acting against shareholders' interests. Members should act in the best interests of the company.
act in good faith to do something believing that it is the right thing to do: Although errors of judgement were made, at all times the company's staff acted in good faith.
(Definition of act verb from the Cambridge Business English Dictionary © Cambridge University Press)
Focus on the pronunciation of act

Definitions of “act” in other dictionaries

Word of the Day

friendship

a situation in which two people are friends

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