Expiry (noun)

1. The act or process of expiring; the cessation of life or existence.
2. The point in time at which something comes to an end or ceases to be valid, such as a contract or a certificate.

Origin:

From middle english espiracioun, from old french esperacion, from latin speratio, from sperare ("to hope").

Examples:

1. The expiry of his visa means he has to leave the country.
2. The expiry date on the food packaging tells us when the product will no longer be safe to eat.
3. The expiry of the lease marked the end of a chapter in their lives.
4. The expiry of the patent allowed other companies to produce generic versions of the drug.
5. The expiry of the agreement led to a renegotiating of the terms.