the fact of something, for example a marriage, having no legal force or no longer being officially recognized; something which is no longer officially recognized 无法律约束力；无效；无法律效力的事物 a decree of nullity (= a statement saying that a marriage is no longer legal) 无效判决 The decision of the committee can now be regarded as a nullity. 委员会的决定现在可以视为无效。
Word Originmid 16th cent.: from French nullité, from medieval Latin nullitas, from Latin nullus ‘none’.