Nullification

[,nʌlɪfɪ'keɪʃən] or [,nʌləfə'keʃən]

(noun.) the act of nullifying; making null and void; counteracting or overriding the effect or force of something.

(noun.) the states'-rights doctrine that a state can refuse to recognize or to enforce a federal law passed by the United States Congress.

Typist: Nadine--From WordNet

(n.) The act of nullifying; a rendering void and of no effect, or of no legal effect.

Inputed by Chris