certified mail

American  

noun

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

---

Etymology

Origin of certified mail

First recorded in 1950–55

Example Sentences

If you file on paper, you should ask for a postmark at the post-office counter or choose certified mail with a return receipt.

From The Wall Street Journal • Jan. 26, 2026

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 • Apr. 9, 2024

Under the terms of his contract, Huggins would have had to submit a letter by registered or certified mail to voluntarily resign.

From Washington Times • Jul. 10, 2023

There is also the cost of envelopes, printer ink and certified mail when sending client letters.

From New York Times • Jun. 7, 2023

If you want to know the date that the Copyright Office receives your material, send it by registered or certified mail and request a return receipt.

From Copyright Basics by Library of Congress. Copyright Office