Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “affect”


verb [T]     /əˈfekt/
CAUSE CHANGE B2 to influence someone or something, or cause them to change : It's a disease which affects many older people . The building was badly affected by the fire .ChangingAdapting and modifying Adapting and attuning to somethingChanging frequentlyAffecting and influencing
CAUSE EMOTION B2 to cause a strong emotion , especially sadness : [often passive] I was deeply affected by the film .Making people sad, shocked and upsetStrong feelings
(Definition of affect verb from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “affect” in other dictionaries

Word of the Day


to mix eggs with a little milk and mix again as they are being fried

Word of the Day


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