n. [ F. invalide, n. & a., L. invalidus, a. See Invalid null. ] A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health who is unable to care for himself. [ 1913 Webster ]

a. [ Pref. in- not + valid: cf. F. invalide, L. invalidus infirm, weak. Cf. Invalid infirm. ] [ 1913 Webster ]

1. Of no force, weight, or cogency; not valid; weak. [ 1913 Webster ]

2. (Law) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement. [ 1913 Webster ]

a. [ See Invalid, n. ] Not well; feeble; infirm; sickly; as, he had an invalid daughter. [ 1913 Webster ]

v. t. 1. To make or render invalid or infirm. “Invalided, bent, and almost blind.” Dickens. [ 1913 Webster ]

2. To classify or enroll as an invalid. [ 1913 Webster ]

Peace coming, he was invalided on half pay. Carlyle. [ 1913 Webster ]

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. [ 1913 Webster ]

adj. deprived of legal force.
Syn. -- nullified. [ WordNet 1.5 ]

adj. tending to invalidate or prove false.
Syn. -- disconfirming. [ WordNet 1.5 +PJC ]

n. The act of inavlidating, or the state of being invalidated. [ 1913 Webster ]

So many invalidations of their right. Burke. [ 1913 Webster ]

‖n. [ F. ] See Invalid, n. [ 1913 Webster ]

n. The condition of an invalid; sickness; infirmity. [ 1913 Webster ]

n. [ Cf. F. invalidité, LL. invaliditas lack of health. ] [ 1913 Webster ]

1. Lack of validity or cogency; lack of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will. [ 1913 Webster ]

2. Lack of health; infirmity. [ Obs. ] Sir W. Temple. [ 1913 Webster ]

n. Invalidity; as, the invalidness of reasoning. [ 1913 Webster ]

a. [ F. valide, L. validus strong, from valere to be strong. See Valiant. ] [ 1913 Webster ]

1. Strong; powerful; efficient. [ Obs. ] “Perhaps more valid arms . . . may serve to better us.” Milton. [ 1913 Webster ]

2. Having sufficient strength or force; founded in truth; capable of being justified, defended, or supported; not weak or defective; sound; good; efficacious; as, a valid argument; a valid objection. [ 1913 Webster ]

An answer that is open to no valid exception. I. Taylor. [ 1913 Webster ]

3. (Law) Having legal strength or force; executed with the proper formalities; incapable of being rightfully overthrown or set aside; as, a valid deed; a valid covenant; a valid instrument of any kind; a valid claim or title; a valid marriage. [ 1913 Webster ]

Syn. -- Prevalent; available; efficacious; just; good; weighty; sufficient; sound; well-grounded. [ 1913 Webster ]

v. t. [ See Valid. ] To confirm; to render valid; to give legal force to. [ 1913 Webster ]

The chamber of deputies . . . refusing to validate at once the election of an official candidate. London Spectator. [ 1913 Webster ]

n. [ Cf. F. validation. ] The act of giving validity. [ R. ] Knowles. [ 1913 Webster ]

n. [ Cf. F. validité, L. validitas strength. ] [ 1913 Webster ]

1. The quality or state of being valid; strength; force; especially, power to convince; justness; soundness; as, the validity of an argument or proof; the validity of an objection. [ 1913 Webster ]

2. (Law) Legal strength, force, or authority; that quality of a thing which renders it supportable in law, or equity; as, the validity of a will; the validity of a contract, claim, or title. [ 1913 Webster ]

3. Value. [ Obs. ] “Rich validity.” Shak. [ 1913 Webster ]

adv. In a valid manner; so as to be valid. [ 1913 Webster ]

n. The quality or state of being valid. [ 1913 Webster ]