1. Asserting that something is true or correct, as with the answer yes: an affirmative reply.2. Giving assent or approval; confirming: an affirmative vote.3. Positive; optimistic: an affirmative outlook.4.Logic Of, relating to, or being a proposition in which the predicate affirms something about the subject, such as the statement apples have seeds.
NOUN:
1. A word or statement of agreement or assent, such as the word yes.2. The side in a debate that upholds the proposition: Her team will speak for the affirmative.
ADVERB:
Informal Used in place of the response yes to express confirmation or consent.