annul - definition and synonyms

verb [transitive] 

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/əˈnʌl/
present tense
I/you/we/theyannul
he/she/itannuls
present participleannulling
past tenseannulled
past participleannulled
  1. to state officially that something such as a marriage, an agreement, or an election has no legal authority

derived word

annulment

noun [countable/uncountable]
singularannulment
pluralannulments