Definitions

1. noun

the act or fact of something becoming invalid or no longer in force, especially a deadline for doing something

“The expiration date on the milk bottle has passed, so it’s time to get rid of it.”

2. noun

the act or fact of something ceasing to exist, be valid, or be in operation

“The company’s patent is due to expiration next year.”

3. noun

the end of a period of time during which something is valid, in force, or in operation

“The expiration of the lease marked the end of the tenant’s occupancy.”

4. verb

to cease to be valid, in force, or in operation

“The contract will expire unless renewed by both parties.”