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    Online English Dictionary

    Wordnet English Dictionary

    a negative statement; a statement that is a refusal or denial of some other statement
    the speech act of negating
    (logic) a proposition that is true if and only if another proposition is false

    Wordnet English Thesaurus

    contradiction, repudiation, refutation rebuttal, nulification cancellation, revocation, repeal, retraction
    reverse, antithesis, contrary, inverse, converse, absence, want

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