Definition of nullity noun from the Oxford Advanced American Dictionary

 

nullity

 noun
noun
NAmE//ˈnʌlət̮i//
 
[singular](formal or law)
 
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the fact of something, for example a marriage, having no legal force or no longer being valid; something which is no longer valid a decree of nullity (= a statement saying that a marriage is no longer legally valid) The decision of the committee can now be regarded as a nullity.
See the Oxford Advanced Learner's Dictionary entry: nullity