invalidation
/ɪnˌvælɪˈdeɪʃn/ 25the act of saying that a document, contract, election, etc. is no longer legally or officially acceptable.
noun [具体名词]失效；无效
The copies of the data are determined to be fresh or stale based on the communication of invalidation messages. 系统将根据无效消息的通信确定数据副本是新鲜的还是陈旧的。
单词造句: