If something invalidates something such as a law, contract, or election, it causes it to be considered illegal. An official decree invalidated the vote in the capital
take away the legal force of or render ineffective; "invalidateas a contract" show to be invalid declare invalid; "The contract was annulled"; "void a plea
To invalidate something such as an argument, conclusion, or result means to prove that it is wrong or cause it to be wrong. Any form of physical activity will invalidate the results
To render invalid; to weaken or lessen the force of; to destroy the authority of; to render of no force or effect; to overthrow; as, to invalidate an agreement or argument