In*val"i*date (?), v. t. [imp. & p. p. Invalidated (?); p. pr. & vb. n. Invalidating.] [From Invalid null.] 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.
© Webster 1913. | 
