Quick definitions from WordNet (nullification)
▸ 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
▸ Also see nullification
▸ 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
▸ Also see nullification