Definition of “antonym” - English Dictionary

“antonym” in British English

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antonymnoun [ C ]

uk /ˈæn.tə.nɪm/ us /ˈæn.t̬ən.ɪm/ specialized

a word that means the opposite of another word:

Two antonyms of "light" are "dark" and "heavy".
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antonymous
adjective uk /ænˈtɒn.ɪ.məs/ us /ænˈtɑː.nə.məs/

"Long" and "short" are antonymous (words).

(Definition of “antonym” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“antonym” in American English

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antonymnoun [ C ]

us /ˈæn·təˌnɪm/

grammar a word or phrase whose meaning is the opposite of another word or phrase

(Definition of “antonym” from the Cambridge Academic Content Dictionary © Cambridge University Press)