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Entry 1 sense Webster, 1913

Nullification

/nŭlˌ-əf-ək-āsh'-ən/ · Nul·li·fi·ca·tion · IPA /ˌnʌlɪfɪˈkeɪʃən/
01 n. The act of nullifying; a rendering void and of no effect, or of no legal effect.
  1. 1.
    The act of nullifying; a rendering void and of no effect, or of no legal effect.
Phrases & compounds
Right of nullification — the right claimed in behalf of a State to nullify or make void, by its sovereign act or decree, an enactment of the general government which it deems unconstitutional.