Also found in: Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.

in·va·lid 1

One who is incapacitated by a chronic illness or disability.
1. Incapacitated by illness or injury.
2. Of, relating to, or intended for invalids.
tr.v. in·va·lid·ed, in·va·lid·ing, in·va·lids
1. To incapacitate physically.
2. Chiefly British To release or exempt from duty because of ill health: "I was not quite sick enough to be invalided out, even though I was of no more use" (Mary Lee Settle).

[From invalid (influenced by French invalide, sickly, infirm).]

in·val·id 2

1. Not legally or factually valid; null: an invalid license.
2. Falsely based or reasoned; faulty: an invalid argument.

[Latin invalidus, weak : in-, not; see in-1 + validus, strong (from valēre, to be strong; see wal- in Indo-European roots).]

in′va·lid′i·ty (-və-lĭd′ĭ-tē) n.
in·val′id·ly adv.


(ˌɪn vəˈlɪd ɪ ti)

lack of validity.
[1540–50; < Medieval Latin invaliditās. See invalid2, -ity]


(ˌɪn vəˈlɪd ɪ ti)

[1905–10; invalid1 + -ity]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.invalidity - illogicality as a consequence of having a conclusion that does not follow from the premisses
illogic, illogicality, illogicalness, inconsequence - invalid or incorrect reasoning
fallaciousness - result of a fallacy or error in reasoning


noun falsity, fallacy, unsoundness, inconsistency, irrationality, illogicality, speciousness, sophism, fallaciousness He brushed aside claims about the invalidity of a means test.
بُطْلان، عَدَم مَفْعوليَّة
ógildi, gildisleysi


A. N
1. [of document, contract] → invalidez f, nulidad f
2. (= illness, disablement) → invalidez f
B. CPD invalidity benefit N (Brit) → prestación f por invalidez
invalidity pension Npensión f de invalidez


[ˌɪnvəˈlɪdɪti] n
[action, procedure, document] → nullité f
(= state of being an invalid) → invalidité f invalidity benefitinvalidity benefit npension f d'invalidité, allocation f d'invalidité


(esp Jur) → Ungültigkeit f; (of deduction, argument)mangelnde Schlüssigkeit or Stichhaltigkeit; (of assumption)Unzulässigkeit f
(= disability)Körperbehinderung f, → Invalidität f


(inˈvӕlid) adjective
(of a document or agreement etc) having no legal force; not valid. Your passport is out of date and therefore invalid.
inˈvalidate (-deit) verb
to make invalid.
invalidity (invəˈlidəti) noun
References in classic literature ?
she added, as if supposing that this translation of the word would effectively prove to Prince Vasili the invalidity of his contention.
6,963,857 uncovered a broad range of prior art references, including two references that each separately can show the patent to be invalid under the strongest level of invalidity evidence, called anticipation.
They can hardly be termed invalidity benefit illnesses.
Infringement and invalidity determinations and injunctions on Unitary Patents will be enforceable across participating member states.
876 billion is allocated for Old-Age Pension, Survivors Pension, Invalidity Pension and Old-Age Grants.
The reason for the high claims of invalidity benefit is because the Thatcher government promoted the movement of income support claimants to invalidity benefit for the sole purpose of lowering the unemployment figures during the 1980s.
The court found that the plaintiff's civil conspiracy and equal protection claims were barred because they implied the invalidity of his commitment.
So saying, since mirror-image couples are physiologically "unequipped" to consummate, so must pervert, ought not this severe impediment, of and by its nature, constitute the same invalidity, particularly in the case of a religious ceremony?
District Court for the District of Delaware seeking declaratory relief of non-infringement, invalidity and unenforceability of the '672 Patent.
Miss Rees, 32, said: ``I finally felt I could go back to work after 10 years on invalidity benefit for depression and anx i e t y.
com, a Web site devoted to "educat[ing] the Christian community concerning the scriptural invalidity of the war on drugs.
Benefits bosses refused to hand over a young mum's invalidity cash - because the letter ordering them to pay up was unreadable.