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English definition of “annul”

annul

verb [T] uk   /əˈnʌl/ (-ll-) specialized us  
to officially announce that something such as a law, agreement, or marriage no longer exists: His second marriage was annulled because he never divorced his first wife.
annulment
noun [C or U] uk   /-mənt/ us  
Judges only grant marriage annulments in exceptional circumstances. The discovery of the election fraud has led to the annulment of 50,000 votes.
(Definition of annul from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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