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Meaning of word invalid from English dictionary with examples, synonyms and antonyms.

invalid   noun

Meaning : Someone who is incapacitated by a chronic illness or injury.

Synonyms : shut-in

invalid   verb

Meaning : Force to retire, remove from active duty, as of firemen.

Meaning : Injure permanently.

Example : He was disabled in a car accident.

Synonyms : disable, handicap, incapacitate

invalid   adjective

Meaning : Having no cogency or legal force.

Example : Invalid reasoning.
An invalid driver's license.

Well grounded in logic or truth or having legal force.

A valid inference.
A valid argument.
A valid contract.
valid

Meaning : No longer valid.

Example : The license is invalid.