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
|This disambiguation page lists articles associated with the title Invalid.
If an internal link led you here, you may wish to change the link to point directly to the intended article.