- IPA[ˌdɛd ˈlɛtə]
- a law or treaty which has not been repealed but is ineffectual or defunct in practice.；a thing which is unimportant or obsolete
noun: dead letter, plural noun: dead letters
- 1. a law or treaty which has not been repealed but is ineffectual or defunct in practice.
- ▪ a thing which is unimportant or obsolete theoretical reasoning is a dead letter to a child
- 2. North American an unclaimed or undelivered piece of mail.
- a place where messages can be left and collected without the sender and recipient meeting.
- IPA[ˌded ˈledər]
- a letter that is undeliverable and unreturnable, typically one with an incorrect address.
Oxford American Dictionary