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Invalid may refer to:

  • Patient, a sick person
  • one who is confined to home or bed because of illness, disability or injury (seen by some as a politically incorrect term)
  • .invalid, a top-level Internet domain not intended for real use

As the opposite of valid:

  • Validity, in logic, true premises cannot lead to a false conclusion
  • Validity (statistics), a measure which is measuring what it is supposed to measure

See also[edit]