top secret

adjective

1

: protected by a high degree of secrecy

a top secret weapon

a top secret meeting

2

a

: containing or being information whose unauthorized disclosure could result in exceptionally grave danger to the nation

top secret messages

compare confidential, secret

b

: of or relating to top secret documents

a top secret clearance

Examples of top secret in a Sentence

The mission is top secret.

Recent Examples on the Web

President Curtis has, especially after the pilot, some very sturdy episodic concepts, from the top secret supermax prison in the Bermuda Triangle to a journey to the center of the Earth to the aforementioned appearance by Ghost Lincoln. — Daniel Fienberg, HollywoodReporter, 24 July 2026

The country singer, 53, attended the July 3 nuptials with his wife, Kimberly Williams-Paisley, after the couple received their invite with top secret instructions. — Leigh Blickley, Entertainment Weekly, 20 July 2026

Taylor Swift and Travis Kelce’s wedding was so top secret that even one of their celebrity guests, Pat McAfee, initially thought his digital invitation was a scam. — Juliana Ukiomogbe, InStyle, 15 July 2026

Most of the information in question was classified as top secret, according to the indictment. — Erin Mansfield, USA Today, 26 June 2026

Word History

First Known Use

1942, in the meaning defined at sense 1

Kids Definition

top secret

adjective

1

: protected by a high degree of secrecy

a top secret meeting

2

: containing information that is very important to the safety and defense of a nation

top secret messages