af·firm·a·tive / əˈfərmətiv/ • adj. agreeing with a statement or to a request: an affirmative answer. ∎ (of a vote) expressing approval or agreement. ∎ supportive, hopeful, or encouraging: the music's natural buoyancy and affirmative character. ∎ active or obligatory: an affirmative duty to stop crime ∎ Gram. & Logic stating that a fact is so; making an assertion.Contrasted with interrogative and negative. • n. a statement of agreement with an assertion or request: he accepted her reply as an affirmative. ∎ (the affirmative) a position of agreement or confirmation: his answer veered toward the affirmative. ∎ Gram. a word or particle used in making assertions. ∎ Logic a statement asserting that something is true of the subject of a proposition. • interj. expressing agreement with a statement or request; yes. PHRASES: in the affirmative so as to accept or agree to a statement or request. DERIVATIVES: af·firm·a·tive·ly adv.