Dictionary

top secret

adjective

: kept completely secret by high government officials

Full Definition of TOP SECRET

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

  1. The mission is top secret.

First Known Use of TOP SECRET

1944

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