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English definition of “antonym”

antonym

noun [C] uk   /ˈæn.tə.nɪm/ us    /-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    /-ˈtɑː.nɪ-/
"Long" and "short" are antonymous (words).
(Definition of antonym from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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