expiry
Word family
- expireverbB2
- expiredadjectiveB2
- expirationnounC1
Synonym discussion
Sense: noun/1
Expiry is common in British-style English for the moment something stops being valid, especially cards, visas, food, medicines, and insurance policies. Expiration usually means the same thing, but it is more common in American English and in technical labels such as expiration date. Deadline is different: it is the latest time by which you must do something, not the moment a document or product loses validity. Termination is more formal and often refers to a contract, service, or agreement being officially ended, sometimes by a person or organization. You can miss a deadline, but a passport, lease, or carton of milk reaches its expiry.
Etymology
Expiry comes from the verb expire, which entered English through French from Latin expirare, originally meaning 'breathe out'. From the older idea of a final breath, English later developed the broader meaning 'come to an end', which explains why expiry can refer both to death and to a document or period ending.