Meaning of “affect” - Learner’s Dictionary

affect

verb [ T ] us uk /əˈfekt/
Extra Examples
The disease affects both humans and animals.His illness affects almost every aspect of his life.His behaviour affects the whole of the class.The new road has affected the value of these houses.
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.
CAUSE EMOTION

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