dead letter

noun

Definition of dead letter

  1. 1 :  something that has lost its force or authority without being formally abolished

  2. 2 :  a letter that is undeliverable and unreturnable by the post office

First Known Use of dead letter

1627


DEAD LETTER Defined for English Language Learners

dead letter

noun

Definition of dead letter for English Language Learners

  • : a letter that cannot be delivered or returned by the post office because of an incorrect address or other problem

  • : a law or agreement that has lost its force or authority

Learn More about dead letter


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