NULLIFICATION
nullification (n<<schwa>>l-i-fi-kay-sh<<schwa>>n), n.1. The act of making something void; specif., the action of a state in abrogating a federal law, on the basis of state sovereignty. [Cases:
States 4.1(1).] 2. The state or condition of being void. See JURY NULLIFICATION.
[Blacks Law 8th]