Expiration (noun)

1. The act or process of breathing out.
2. The act of coming to an end; termination.

Origin:

Late middle english: from latin expiratio(n-), from expirare "breathe out", from ex- "out" + spirare "breathe".

Examples:

1. The doctor monitored the patient's expiration to check their lung function.
2. The sound of his expiration was harsh and labored, indicating a respiratory problem.
3. The expiration of the contract marked the end of the business partnership.
4. The expiration of the lease meant that the tenants had to vacate the premises.
5. The expiration of the patent meant that other companies could now produce the product.