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WordReference Random House Unabridged Dictionary of American English © 2024nul•li•fi•ca•tion (nul′ə fi kā′shən),USA pronunciation n. - an act or instance of nullifying.
- the state of being nullified.
- Government(often cap.) the failure or refusal of a U.S. state to aid in enforcement of federal laws within its limits, esp. on Constitutional grounds.
- Late Latin nūllificātiōn- (stem of nūllificātiō) contempt, equivalent. to nūllificāt(us) (past participle of nūllificāre to despise) + -iōn- -ion. See nullify
- 1620–30
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