Definition of affect verb from the Oxford Advanced American Dictionary

Oxford3000 Academic

affect

verb
/əˈfɛkt/
 
 
1 [often passive] affect someone/something to produce a change in someone or somethingHow will these changes affect us?Your opinion will not affect my decision.The south of the country was worst affected by the drought.2 [often passive] affect someone/something (of a disease) to attack someone or a part of the body; to make someone become sickThe condition affects one in five women.Rub the ointment into the affected areas.3 affect someone [often passive] to make someone have strong feelings of sadness, anger, etc.They were deeply affected by the news of her death.Try not to let his problems affect you too much.4 affect (to do) something (formal) to pretend to be feeling or thinking somethingShe affected a calmness she did not feel.5 affect something (formal, disapproving) to use or wear something that is intended to impress other people synonym put onI wish he wouldn't affect that ridiculous accent.
Usage noteUsage note: affect effectaffect verb= “to have an influence on someone or something”: Does television affect children’s behavior? It is not a noun.effect noun= “result, influence”: Does television have an effect on children’s behavior?effect verb is formal and means “to achieve or produce”: The negotiators hope to effect a reconciliation. Governments have the tools to use to effect change.