Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “effect”

effect

noun     /ɪˈfekt/
B1 [C, U] a change, reaction, or result that is caused by something: The accident had a huge effect on her life. We don't know the long-term effects of this drug.Outcomes and consequences
in effect used to say what the real situation is: This means, in effect, that the plan has been scrapped.Reality and truth
come/go into effect to start being used: New food safety rules come into effect on Monday.Starting and beginningStarting again
take effect B2 to start to produce results or changes: The anaesthetic takes effect in about ten minutes.Outcomes and consequences
to that effect used to say that you are giving the general meaning of something but not the exact words: He said he was bored with school or something to that effect.Approximate
a sound/special/visual, etc effect B1 a sound, image, etc that is created artificially → See also side effectProduction, direction and recording
(Definition of effect noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “effect” in other dictionaries

Word of the Day

neighbourly

friendly or helpful

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