What does expiry mean?
Expiry is a noun denoting the moment at which something ceases to be valid, effective, or fit for use. It is the standard British English counterpart to the American "expiration", and it appears constantly in legal, financial, and commercial language: contracts have an expiry, passports carry an expiry date, and supermarket goods must be withdrawn after theirs. The word carries no strong emotional charge; it is administrative and matter-of-fact, though it can acquire urgency in phrases about looming deadlines or lapsed credentials. Most usage today clusters around two senses: the termination of documents, memberships, offers, and agreements, and the point at which perishable products pass their safe or optimal period of use. Its root lies in the Latin verb "expirare", literally "to breathe out", which came to mean dying out or coming to an end — a vivid image hiding inside an otherwise dry piece of paperwork vocabulary.
nounThe date or point in time at which something, such as a document, contract, licence, or perishable product, comes to an end and is no longer valid or usable.
- The ending of the valid period of a document, agreement, offer, or licence.
- The point at which a food product or medicine is no longer considered fresh or safe to use.
"Please check the expiry date before taking the medication."
"The contract will automatically renew unless notice is given prior to its expiry."
"Shops are legally required to remove goods from sale once they pass their expiry date."
The plural is regular and used mainly when referring to multiple dates or end-points, e.g. across a portfolio of contracts.
"The system tracks all upcoming expiries for the firm's options portfolio."
That little date stamped on your milk carton has its own dedicated word in Britain — and Americans have been quietly using a different one all along.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of expiry
Expiry derives from the Latin verb "expirare", formed from the prefix "ex-" ("out") plus "spirare" ("to breathe"), hence literally "to breathe out". In medieval and early modern usage, "expire" came to signify breathing one's last or coming to an end, and the noun "expiry" emerged in English as the act or time of such ending, particularly in legal contexts. It shares this Latin root "spirare" with words such as "inspire", "respire", "consipre", and "spirit". The American variant "expiration" was formed directly from the same verb family.
Related word forms
How expiry is actually used
"Expiry" is the standard noun in British English; American English strongly favours "expiration" (as in "expiration date"), so writers addressing an international audience should choose consistently. The word is neutral in register and appears most often in legal, commercial, and everyday product-labelling contexts.
Easily confused with expiry
"Expiration" means exactly the same thing but is the standard term in American English, whereas "expiry" is the standard British form.