certified mail

noun

1. uninsured first-class mail requiring proof of delivery.

Word History and Origins

Origin of certified mail¹

First recorded in 1950–55

Example Sentences

We now offer state-mandated informed-consent materials via certified mail, thus starting the clock on the 48-hour waiting period and eliminating one visit, which can be critical for patients traveling hundreds of miles.

From Time

The final piece, which Meyers sent via certified mail Tuesday, is expected to arrive by Saturday.

From Washington Post

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