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]