Meaning of “antithesis” in the English Dictionary

"antithesis" in English

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antithesisnoun [ C ]

uk /ænˈtɪθ.ə.sɪs/ us /ænˈtɪθ.ə.sɪs/ plural antitheses uk /-siːz/ us

the exact opposite:

She is slim and shy - the very antithesis of her sister.
He is the exact antithesis of what I find attractive in men.

a contrast between two things:

Thanks to the collapse of communism the political antithesis between Left and Right is less important.
adjective uk /ˌæn.tɪˈθet.ɪ.kəl/ us /ˌæn.t̬əˈθet̬.ɪ.kəl/ also antithetic, formal

antithetical views

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

"antithesis" in American English

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antithesisnoun [ C/U ]

us /ænˈtɪθ·ə·sɪs/ plural antitheses /ænˈtɪθ·əˌsiz/

the exact opposite, or opposition:

[ C ] The relaxed company management is the antithesis of a formal bureaucracy.

literature In formal argument, the antithesis is the opposite of the thesis (= the main idea).

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