invalidate
v. (-ting) make (a claim etc.) Invalid. invalidation n.
v. t. 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.
v. (-ting) make (a claim etc.) Invalid. invalidation n.
v. t. 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.