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Meaning Of Invalid

a.

Of no force, weight, or cogency; not valid; weak.
a.

Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.
a.

A person who is weak and infirm; one who is disabled for active service; especially, one in chronic ill health.
n.

Not well; feeble; infirm; sickly; as, he had an invalid daughter.
v. t.

To make or render invalid or infirm.
v. t.

To classify or enroll as an invalid.

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