dead letter

noun

1
: something that has lost its force or authority without being formally abolished
As a result of such loopholes, the statute became a dead letter.William M. McGovern, Jr. et al.
2
: a letter that is undeliverable and unreturnable by the post office

Examples of dead letter in a Sentence

Recent Examples on the Web
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Agreements meant to last decades became a dead letter. Stephania Taladrid, New Yorker, 17 June 2026 The war had sort of declared it dead letter, but not so much in the Constitution. David Frum, The Atlantic, 10 June 2026 The War Powers Resolution has been a dead letter for decades. Baltimore Sun Staff, Baltimore Sun, 20 May 2026 That amendment had been made a dead letter by Jim Crow state legislatures and an acquiescent Supreme Court. Robert D. Bland, The Conversation, 30 Apr. 2026 See All Example Sentences for dead letter

Word History

First Known Use

1663, in the meaning defined at sense 1

Time Traveler
The first known use of dead letter was in 1663

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Cite this Entry

“Dead letter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/dead%20letter. Accessed 25 Jun. 2026.

Kids Definition

dead letter

noun
1
: something that has lost its force or authority without being abolished
2
: a letter that cannot be delivered or returned by the post office
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