1. 废除；取消；宣告无效
The annulment of a contract or marriage is an official declaration that it is invalid, so that legally it is considered never to have existed.

1. the act of abrogating
an official or legal cancellation

Synonym: abrogationrepeal

2. (law) a formal termination (of a relationship or a judicial proceeding etc)

Synonym: invalidation

3. the state of being cancelled or annulled

Synonym: revocation