Dictionary

expiration date

noun

: the date when something (such as a credit card or driver's license) can no longer legally or officially be used

: the date when something (such as milk or medicine) can no longer be sold because it may no longer be good or effective

Full Definition of EXPIRATION DATE

1
:  the date after which something (as a credit card) is no longer in effect
2
:  the date after which a product (as food or medicine) should not be sold because of an expected decline in quality or effectiveness
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First Known Use of EXPIRATION DATE

circa 1946

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