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).
The new rates will affect all consumers including businesses.
Researchers are looking at how a mother’s health can affect the baby in the womb.
His illness affects almost every aspect of his life.
Farmers and market gardeners have been badly affected by the drought.
You couldn’t fail to be affected by the film.