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

Everything was so under wraps, especially our legacy cast members — super top secret. —Emily Longeretta, Variety, 4 Sep. 2025

All the actors were scanned using Google’s next generation top secret scanning stage. —Melanie Goodfellow, Deadline, 1 Sep. 2025

While most college coaches treat their practices like a top secret meeting, Dykes has maintained a wide-open media policy, allowing reporters to watch full practices in the spring and fall camps, and even allowing fans and media to watch entire scrimmages. —Steven Johnson, Fort Worth Star-Telegram, 29 Aug. 2025

The Soviet Union tested more than 450 bombs at its Semipalatinsk test site in Kazakhstan from 1949 to 1989, in top secret towns, built for nuclear testing. —Issy Ronald, CNN Money, 24 Aug. 2025

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