What is the meaning of dead letter?

noun

  • The state of something that has outlived its relevance.
  • Mail that can neither be delivered nor returned.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). dead letter. Retrieved September 20, 2026, from http://smartdefine.org/dead_letter/definitions/1323657
ChicagoWordNet. 2010. "dead letter" http://smartdefine.org/dead_letter/definitions/1323657 (accessed September 20, 2026).
HarvardWordNet 2010, dead letter, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/dead_letter/definitions/1323657>.
MLAWordNet. "dead letter" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/dead_letter/definitions/1323657>