a verb is a word used to describe an action, occurrence or state of being. To invalidate means to make something legally null or void. In this sense, the verb invalidate indicates that something previously accepted as valid, valid and correct is no longer legally valid.
the verb invalidate is most commonly used in a legal context, where a contract, agreement, or law is declared to be legally null and void. In less technical contexts, it can also refer to making something non-functioning or inoperable.
1. The new regulations invalidated the original contract.
2. He invalidated her argument by citing authoritative sources.
3. Invalidating the warranty made the parts unusable.
when using the verb invalidate, be sure to read the context carefully. It may be easy to mistakenly use a word like 'invalid' or 'void' when the intention is to invalidate something.