The meaning of INVALID is not valid. How to use invalid in a sentence.

Define invalid. invalid synonyms, invalid pronunciation, invalid translation, English dictionary definition of invalid. n. One who is incapacitated by a chronic illness or disability. adj. 1. …

INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

If an action, procedure, or document is invalid, it cannot be accepted, because it breaks the law or some official rule. The trial was stopped and the results declared invalid. We cannot accept …

Sep 22, 2025 · invalid (comparative more invalid, superlative most invalid) Not valid; not true, correct, acceptable or appropriate. Your argument is invalid because it uses circular …

a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life. [Archaic.]a member of the armed forces disabled for active service.

INVALID definition: an infirm or sickly person. See examples of invalid used in a sentence.

Definition of invalid adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

The judge declared that the contract was invalid. Her husband has become an invalid. She cares for her invalid husband at home. He was invalided out of the army. He was invalided home.

• For this reason, you can readily identify them as valid or invalid. • But the vote has been declared invalid because fewer than half the parents took part in the ballot.