invalid Meaning, Definition & Usage

  1. noun someone who is incapacitated by a chronic illness or injury
    shut-in.
  2. verb force to retire, remove from active duty, as of firemen
  3. verb injure permanently
    handicap; disable; incapacitate.
    • He was disabled in a car accident
  4. adjective having no cogency or legal force
    • invalid reasoning
    • an invalid driver's license
  5. adjective satellite no longer valid
    • the license is invalid

WordNet

In*val"id adjective
Etymology
Pref. in- not + valid: cf. F. invalide, L. invalidus infirm, weak. Cf. Invalid infirm.
Definitions
  1. Of no force, weight, or cogency; not valid; weak.
  2. (Law) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
In"va*lid noun
Etymology
F. invalide, n. & a., L. invalidus, a. See Invalid null.
Definitions
  1. A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
In"va*lid adjective
Etymology
See Invalid, n.
Definitions
  1. Not well; feeble; infirm; sickly; as, he had an invalid daughter.
In"va*lid transitive verb
Definitions
  1. To make or render invalid or infirm. "Invalided, bent, and almost blind." Dickens.
  2. To classify or enroll as an invalid.
    Peace coming, he was invalided on half pay. Carlyle.

Webster 1913