Definitions from Wiktionary (invalid)

▸ adjective:  Not valid; not true, correct, acceptable or appropriate.
▸ noun:  (dated, sometimes offensive) Any person with a disability or illness.
▸ noun:  (dated, sometimes offensive) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
▸ noun:  (archaic) A disabled member of the armed forces; one unfit for active duty due to injury.
▸ adjective:  Suffering from disability or illness.
▸ adjective:  Intended for use by an invalid.
▸ verb:  (British, transitive) To exempt from (often military) duty because of injury or ill health.
▸ verb:  (transitive) To make invalid or affect with disease.
▸ Also see invalid

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