Look up nullification or nullify in Wiktionary, the free dictionary.
Nullification may refer to:
Nullification (U.S. Constitution), the legal principle that any federal enactment which is not "made in Pursuance" of the Constitution under Article VI, Clause 2 is ipso facto null and void.,
Nullification Crisis, the 1832 confrontation between the U.S. government and South Carolina over the latter's attempt to unconstitutionally nullify a federal law
Ordinance of Nullification,
Jury nullification, a legal term that refers to a jury's ability to deliver a verdict knowingly in contradiction to written law,
Nullification, a form of body modification involving the voluntary removal of body parts