名詞 annulment:

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

an.nul.ment

n.（名詞）
An act of making or declaring void.
廢除，取消；宣布無效：使或宣布無效的行為
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.
宣告婚姻無效：法院對已發(fā)生或將發(fā)生的不完美婚姻所作的無效宣告