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English definition of “antithesis”

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antithesis

noun [C/U]  /ænˈtɪθ·ə·sɪs/ ( plural antitheses  /ænˈtɪθ·əˌsiz/) us  
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)
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