nullity/ˈnʌlətɪ; `nʌlətɪ/ n[U]lack of legal force; lack of validity 无法律约束力; 无效 the nullity of a marriage 婚姻无效 [attrib 作定语]a nullity suit, ie legal action that asks for a marriage to be declared null and void 要求宣判婚姻无效的诉讼.
牛津英汉双解词典