DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   annulment
       n 1: the state of being cancelled or annulled [syn:
            revocation, annulment]
       2: (law) a formal termination (of a relationship or a judicial
          proceeding etc) [syn: annulment, invalidation]
       3: the act of abrogating; an official or legal cancellation
          [syn: abrogation, repeal, annulment]