名詞 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
   同義詞：override

nul.li.fi.ca.tion

n.（名詞）

The act of nullifying.
無效：使…無效的行為
The state of being nullified.
取消：被取消的狀態(tài)
Refusal or failure of a U.S. state to recognize or enforce a federal law within its boundaries.
州對國會法令拒絕執(zhí)行：美國的一個(gè)州在其境內(nèi)對聯(lián)邦法律拒絕或不能夠承認(rèn)或執(zhí)行

【引伸】
nul.lifica.tionist
n.（名詞）