present participle of invalid

(UK) The act of exempting someone from duty because of injury or ill health.

invalidity

plural of invalid

present participle of invalidate

(Britain, transitive) To exempt from (often military) duty because of injury or ill health. / (transitive) To make invalid or affect with disease.

Not valid; not true, correct, acceptable or appropriate.

(dated, sometimes offensive) Any person with a disability or illness.

Suffering from disability or illness. / Intended for use by an invalid.

The act of invalidating, or the state of being invalidated