Expiry/ɪkˈspaɪəri/ Definition 1 of 3Pro Tip 1/2Validity Period Expiry marks the end of a time when something can be used or is effective. Check the expiry on your passport before booking a trip. Pro Tip 2/2Common Usage Often used in the context of perishable items like food, medications, or offers. The expiry of the discount is at midnight, so we need to hurry!