top secret

adjective

Definition of top secret

  1. 1 :  protected by a high degree of secrecy a top secret weapon a top secret meeting

  2. 2a :  containing or being information whose unauthorized disclosure could result in exceptionally grave danger to the nation top secret messages — compare confidential, secretb :  of or relating to top secret documents a top secret clearance

Examples of top secret in a Sentence

  1. The mission is top secret.

First Known Use of top secret

1944


TOP SECRET Defined for English Language Learners

top secret

adjective

Definition of top secret for English Language Learners

  • : kept completely secret by high government officials


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