Definition of “affect” - English Dictionary

“affect” in British English

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affectverb [ T ]

uk /əˈfekt/ us /əˈfekt/

affect verb [ T ] (INFLUENCE)

B2 to have an influence on someone or something, or to cause a change in someone or something:

Both buildings were badly affected by the fire.
The divorce affected every aspect of her life.
It's a disease that affects mainly older people.
I was deeply affected by the film (= it caused strong feelings in me).

More examples

affect verb [ T ] (PRETEND)

formal to pretend to feel or think something:

To all his problems she affected indifference.

formal mainly disapproving to start to wear or do something in order to make people admire or respect you:

At university he affected an upper-class accent.
He's recently affected a hat and cane.

(Definition of “affect” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“affect” in American English

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affectverb [ T ]

us /əˈfekt/

affect verb [ T ] (INFLUENCE)

to have an influence on someone or something:

The disease only affects cattle.
I was deeply affected by the film.

affect verb [ T ] (PRETEND)

to pretend to be or have something:

Since joining the band he’s affected a ridiculous southern accent.

(Definition of “affect” from the Cambridge Academic Content Dictionary © Cambridge University Press)