NULLIFICATION
nullification, override
(noun) the act of nullifying; making null and void; counteracting or overriding the effect or force of something
nullification
(noun) the states’-rights doctrine that a state can refuse to recognize or to enforce a federal law passed by the United States Congress
Source: WordNet® 3.1
Etymology
Noun
nullification (countable and uncountable, plural nullifications)
The act of nullifying; a rendering void and of no effect, or of no legal effect.
removal
Source: Wiktionary
Nul`li*fi*ca"tion, n. Etym: [L. nullificatio contempt. See Nullify.]
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition