Definition of affirmative noun from the Oxford Advanced Learner's Dictionary

 

affirmative

 noun
noun
BrE BrE//əˈfɜːmətɪv//
 
; NAmE NAmE//əˈfɜːrmətɪv//
 
 
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(formal) a word or statement that means ‘yes’; an agreement or a confirmation She answered in the affirmative (= said ‘yes’). She asked if he would give his support to the scheme and he answered in the affirmative. opposite negative Word Origin late Middle English (in the sense ‘assertive, positive’): via Old French from late Latin affirmativus, from affirmare ‘assert’, from ad- ‘to’ + firmus ‘strong’.
See the Oxford Advanced American Dictionary entry: affirmative