Invalid
Encyclopedia
Invalid may refer to:
As the opposite of valid:
- PatientPatientA patient is any recipient of healthcare services. The patient is most often ill or injured and in need of treatment by a physician, advanced practice registered nurse, veterinarian, or other health care provider....
, a sick person - A person with a disabilityDisabilityA disability may be physical, cognitive, mental, sensory, emotional, developmental or some combination of these.Many people would rather be referred to as a person with a disability instead of handicapped...
- .invalid.invalidThe name invalid is reserved by the Internet Engineering Task Force in RFC 2606 as a domain name that may not be installed as a top-level domain in the Domain Name System of the Internet.-Reserved DNS names:...
, a top-level Internet domain not intended for real use
As the opposite of valid:
- ValidityValidityIn logic, argument is valid if and only if its conclusion is entailed by its premises, a formula is valid if and only if it is true under every interpretation, and an argument form is valid if and only if every argument of that logical form is valid....
, in logic, true premises cannot lead to a false conclusion - Validity (statistics)Validity (statistics)In science and statistics, validity has no single agreed definition but generally refers to the extent to which a concept, conclusion or measurement is well-founded and corresponds accurately to the real world. The word "valid" is derived from the Latin validus, meaning strong...
, a measure which is measuring what it is supposed to measure