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

 

affirmative

 adjective
adjective
BrE BrE//əˈfɜːmətɪv//
 
; NAmE NAmE//əˈfɜːrmətɪv//
 
 
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(formal) an affirmative word or reply means ‘yes’ or expresses agreement an affirmative response to the question 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