Meaning of “effect” - Learner’s Dictionary

effect

noun us uk /ɪˈfekt/
Extra Examples
a calming effectthe overall effectThe drugs will have an immediate effect.It's important to protect your skin from the harmful effects of the sun.Police attempts to calm the violence had completely the opposite effect.

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.
in effect

used to say what the real situation is:

This means, in effect, that the plan has been scrapped.
come/go into effect

to start being used:

New food safety rules come into effect on Monday.
take effect

B2 to start to produce results or changes:

The anaesthetic takes effect in about ten minutes.
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.
a sound/special/visual, etc effect

B1 a sound, image, etc that is created artificially

→ See also side effect

(Definition of “effect noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)