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

 

antonym

 noun
noun
BrE BrE//ˈæntənɪm//
 
; NAmE NAmE//ˈæntənɪm//
 
(specialist)
 
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a word that means the opposite of another word synonym opposite ‘Old’ has two possible antonyms: ‘young’ and ‘new’. a dictionary of antonyms compare synonym Word Origin mid 19th cent.: from French antonyme, from ant- (from Greek anti- ‘against’) + Greek onuma ‘a name’.
See the Oxford Advanced American Dictionary entry: antonym