What is the meaning of invalid?

noun

  • Someone who is incapacitated by a chronic illness or injury.

verb

  • Force to retire, remove from active duty, as of firemen.
  • Injure permanently.
    • usage: "He was disabled in a car accident"

adjective

  • Having no cogency or legal force.
    • usage: "invalid reasoning"; "an invalid driver's license"
  • No longer valid.
    • usage: "the license is invalid"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). invalid. Retrieved September 20, 2026, from http://smartdefine.org/invalid/definitions/1176869
ChicagoWordNet. 2010. "invalid" http://smartdefine.org/invalid/definitions/1176869 (accessed September 20, 2026).
HarvardWordNet 2010, invalid, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/invalid/definitions/1176869>.
MLAWordNet. "invalid" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/invalid/definitions/1176869>
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