Invalid
From Wikipedia, the free encyclopedia
Look up invalid in Wiktionary, the free dictionary.
Invalid may refer to:
- Patient, a sick person
- A person with a disability
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
- .invalid, a top-level domain not intended for real use
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