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Definitions of invalid
  1. noun
    someone who is incapacitated by a chronic illness or injury

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  2. verb
    injure permanently
    type of:
  3. verb
    force to retire, remove from active duty, as of firemen
    type of:
  4. adjective
    having no cogency or legal force
    "invalid reasoning" "an invalid driver's license"
    Opposite:
  5. adjective
    no longer valid
    "the license is invalid"

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