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

In its filing, the Postal Service said it’s also seeking price adjustments on special services such as money order fees and certified mail.

From Seattle Times

If you must mail an important or large payment, it might be wise to pay for tracking — certified mail, for example, or a signature confirmation upon delivery — as a safeguard.

From New York Times

According to New York law, companies must notify renters by a hand-delivered letter; registered or certified mail; or by an email paired with a U.S.

From Seattle Times

You have two options for filing the petition — filing personally in the proper court or via certified mail.

From Encyclopedia.com

Use certified mail to send the letter so that you have proof that it was delivered.

From Encyclopedia.com