Dead letter

noun

Definitions

Noun
  1. 1
    An item of mail that cannot be delivered to its intended recipient; after some time it is returned to the sender, or destroyed.
  2. 2
    mail that can neither be delivered nor returned wordnet
  3. 3
    A law or other measure that is no longer enforced.

    "Laws are a dead letter, without courts to expound and define their true meaning and operation."

  4. 4
    the state of something that has outlived its relevance wordnet
  5. 5
    Anything that has lost its authority or influence despite still being in existence or formally in force. broadly

    "I have thought proper to premise thus much, lest the incredible tale I have to tell should be considered rather the raving of a crude imagination, than the positive experience of a mind to which the reveries of fancy have been a dead letter and a nullity."

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