title: Invalid
text: # Invalid
  
  Invalid may refer to:
  
  * Patient, a sick person
  * one who is confined to home or bed because of illness, disability or injury (sometimes considered 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
  