nullification

名词 nullification:

1. the states'-rights doctrine that a state can refuse to recognize or to enforce a federal law passed by the United States Congress
2. the act of nullifying; making null and void; counteracting or overriding the effect or force of something
   同义词：override

nul.li.fi.ca.tion

n.（名词）

The act of nullifying.
无效：使…无效的行为
The state of being nullified.
取消：被取消的状态
Refusal or failure of a U.S. state to recognize or enforce a federal law within its boundaries.
州对国会法令拒绝执行：美国的一个州在其境内对联邦法律拒绝或不能够承认或执行

【引伸】
nul.lifica.tionist
n.（名词）