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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Put another way, ICE’s new interpretation turns the statute into a dead letter. Noah Feldman, Twin Cities, 6 Feb. 2026 Put another way, ICE’s new interpretation turns the statute into a dead letter. Noah Feldman, Mercury News, 4 Feb. 2026 That amendment had been made a dead letter by Jim Crow state legislatures and an acquiescent Supreme Court. Robert D. Bland, The Conversation, 3 Feb. 2026 But despite the positive attention these proposals initially received, most of them remain dead letters just one year later. Matthias Matthijs, Foreign Affairs, 12 Dec. 2025 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 10 Feb. 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
Last Updated: - Updated example sentences
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