From Wikipedia, the free encyclopedia
|Look up invalid in Wiktionary, the free dictionary.|
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
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