What does "expiration date" mean?

A date by which an object either should not be used or loses its value, depending upon the item.

Expiration date

noun

noun ·Rare ·Advanced level

Noun

1
A date by which an object either should not be used or loses its value, depending upon the item.
"credit card expiration date"

"Well, in the mercy of God we are normally unaware of our personal expiration date."