Invalid

Invalid may refer to:

• Patient, a sick person
• A person with a disability
• .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

• All pages beginning with "Invalid"
• All pages with titles containing "Invalid"
• Void (disambiguation)