Invalid may refer to: Patient, a sick person. one who is confined to home or bed because of illness, disability or injury (sometimes considered a politically incorrect term) Invalid, a 2023 Slovak black comedy movie. .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 with titles beginning with Invalid . All pages with titles containing Invalid. Void (disambiguation)
https://en.wikipedia.org/wiki/Invalid