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Definition of invalid:

  1. A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
  2. Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
  3. Not well; feeble; infirm; sickly; as, he had an invalid daughter.
  4. Of no force, weight, or cogency; not valid; weak.
  5. To classify or enroll as an invalid.
  6. To make or render invalid or infirm.


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