The act of invalidating, or the state of being invalidated

plural of invalidation

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

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

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

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

plural of invaliding

simple past tense and past participle of invalidate

Made invalid.

Third-person singular simple present indicative form of invalidate