nul·li·fi·ca·tion /ˌnʌləfəˈkeʃən/
無效,廢棄,取消
Nul·li·fi·ca·tion n. The act of nullifying; a rendering void and of no effect, or of no legal effect.
Right of nullification (U. S. Hist.), 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.
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nullification
n 1: the states'-rights doctrine that a state can refuse to
recognize or to enforce a federal law passed by the
United States Congress
2: the act of nullifying; making null and void; counteracting
or overriding the effect or force of something [syn: override]