annulment

名词 annulment:

1. the state of being cancelled or annulled
   同义词：revocation
2. (law) a formal termination (of a relationship or a judicial proceeding etc)
   同义词：invalidation
3. the act of abrogating; an official or legal cancellation
   同义词：abrogation, repeal

an.nul.ment

n.（名词）
An act of making or declaring void.
废除，取消；宣布无效：使或宣布无效的行为
The retrospective as well as prospective invalidation of a marriage, as for nonconsummation, effected by means of a declaration stating that the marriage was never valid.
宣告婚姻无效：法院对已发生或将发生的不完美婚姻所作的无效宣告