nullificationn.
英 ,nʌlɪfɪ'keɪʃən | 美 ,nʌləfə'keʃən
中文n. 无效；废弃；取消；（美）州对联邦法令的拒绝执行或承认
词根词源
nullification (n.)in U.S. political sense of "a state\\'s refusing to allow a federal law to be enforced," 1798, in Thomas Jefferson; from Late Latin nullificationem (nominative nullificatio) "a making as nothing," from past participle stem of nullificare (see nullify). Related: Nullificationist.
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