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certified mail
noun
- uninsured first-class mail requiring proof of delivery.
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Word History and Origins
Origin of certified mail1
First recorded in 1950–55
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Example Sentences
On Oct. 18, Rangan sent Vanatta a threatening letter via certified mail, demanding Obie returned to the rescue by Oct. 24—or else.
From The Daily Beast
A letter will be sent by certified mail informing your son of a convening date of the board.
From Project Gutenberg
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