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Longman Dictionary of Contemporary English
invalidate
verb
EXAMPLES FROM OTHER ENTRIES
▪ If we look closely at Professor Thomson's argument, we see that his conclusion is invalidated by a number of factual errors.
▪ None of the more recent views invalidates Hahnemann's original discoveries or teachings.
▪ The Educational Testing Service invalidated the scores of 18 students.
▪ The elements of Christianity that come from older beliefs do not necessarily invalidate the religion.
The Collaborative International Dictionary
Invalidate

Invalidate \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.

Douglas Harper's Etymology Dictionary
invalidate

1640s, from invalid + -ate (2). Related: Invalidated; invalidating.

Wiktionary
invalidate

vb. To make invalid. Especially applied to contract law.

WordNet
invalidate
  1. v. declare invalid; "The contract was annulled"; "void a plea" [syn: annul, quash, void, avoid, nullify] [ant: validate]

  2. of cheques or tickets [syn: cancel]

  3. show to be invalid [syn: nullify] [ant: validate]

  4. take away the legal force of or render ineffective; "invalidateas a contract" [syn: void, vitiate] [ant: validate]

Usage examples of "invalidate".

This dictum became, two years later, accepted doctrine when the Court invalidated a State law on the ground that it abridged freedom of speech contrary to the due process clause of Amendment XIV.

But if this were done outside a case of urgency, each would sin grievously, both the baptizer and the baptized, and thus the baptismal effect would be frustrated, although the sacrament itself would not be invalidated.

The judge, in giving sentence, said a condition, criminal per se, not fulfilled, did not invalidate an agreement--a sentence abounding in wisdom, especially in this instance.

Should a defendant insist upon a jury trial today, this verification would be most important, since an improperly empaneled jury would invalidate the proceedings.

Justice Black in a dissent supported by Justices Douglas and Murphy thought that the case was justiciable and would have invalidated the reapportionment, leaving the State free to elect all of its representatives from the State at large.

On his desk was the Order of Rescission that would invalidate all Slotter Key letters of marque and order all its privateers to cease operations.

When the virtuous Fulton County Commission approved the rezoning proposal to allow Mercator to build, CEU filed suit to invalidate the changes.

In less than a week, the government seized control of the riping process and invalidated every public sector license issued.

The pain involved in vivisection often creates such an abnormal state as to weaken or invalidate the conclusions drawn in connection with it.

Later cases were to settle further that the enactment of a national bankruptcy law does not invalidate State laws in conflict therewith but serves only to relegate them to a state of suspended animation with the result that upon repeal of the national statute they again come into operation without reenactment.

Strangely enough, Brine took comfort in the fact that this experience was invalidating every assumption he had ever made about the nature of the world.

And to them was added the irritant provided by the Wilsonian program for national self-determination, which, as Sykes himself was to note, seemed to invalidate the whole skeleton of colonial and partitionary schemes arrived at jointly between the Powers.

As in the case of a trinary star system, this invalidates a perturbative approach.

Court invalidated laws against peaceful picketing, including the carrying of signs and banners.

An act of adultery on your part would certainly allow Sir Giles to obtain a divorce on grounds which would invalidate the reversionary clause.