VERB
使無效;使作廢
If something invalidates something such as a law, contract, or election, it causes it to be considered illegal.
例句
An official decree invalidated the vote in the capital...
一份官方法令宣布在首都舉行的投票無效。
A contract signed now might be invalidated at some future date.
現在簽訂的合同可能在將來的某一天就會失效。