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    Online English Dictionary

    Wordnet English Dictionary

    declare invalid; "The contract was annulled"; "void a plea"
    show to be invalid
    make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"

    Wordnet English Thesaurus

    annul, render null and void, void, invalidate;abrogate, repeal, reverse, rescind, revoke, cancel, abolish, countermand, do away with, negate, quash, counteract
    neutralize, negate, negative

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