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invalid
An invalid is a sick, weak person. (noun)
An example of an invalid is a feeble old woman in a hospital who cannot walk.
Invalid means not correct or provable or not legally recognized. (adjective)
- An example of invalid is a theory that has been proven wrong.
- An example of invalid is a marriage without a proper marriage license.
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See invalid in Webster's New World College Dictionary
See invalid in American Heritage Dictionary 4
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