"affirmative" in the noun sense
1. affirmative
a reply of affirmation
"he answered in the affirmative"
"affirmative" in the adjective sense
1. affirmative, affirmatory
affirming or giving assent
"an affirmative decision"
"affirmative votes"
2. affirmative, optimistic
expecting the best
"an affirmative outlook"
3. approving, affirmative, approbative, approbatory, plausive
expressing or manifesting praise or approval
"approbative criticism"
"an affirmative nod"
Source: WordNet® (An amazing lexical database of English)
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