Word forms: invalidates
1. verb To invalidate something such as an argument, conclusion, or result means to prove that it is wrong or cause it to be wrong. [V n] ⇒ Any form of physical activity will invalidate the results. [V n] ⇒ Some of the other criticisms were invalidated years ago. 2. verb If something invalidates something such as a law, contract, or election, it causes it to be considered illegal. [V n] ⇒ An official decree invalidated the vote in the capital. [V n] ⇒ A contract signed now might be invalidated at some future date.
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