adjective

Agreeing with or consenting to a statement or request.

an affirmative answer

noun

A statement of agreement with or consent to an assertion or request.

he accepted her reply as an affirmative

exclamation

Expressing agreement with or consent to a statement or request; yes.

‘Affirmative, sir,’ responded the ship’s tactical officer.

all right,alright,very well,of course,by all means,sure,certainly,absolutely,indeed,affirmative,in the affirmative,agreed,roger