See more synonyms for top-secret on
adjective (of information, a document, etc.)
  1. bearing the classification top-secret, the highest level of classified information.
  2. limited to persons authorized to use anything so classified.Compare classification(def 5).

Origin of top-secret

First recorded in 1940–45; top1 + secret Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for top-secret

classified, hush-hush

Examples from the Web for top-secret

Contemporary Examples of top-secret

Historical Examples of top-secret

  • You'd think so, with all the top-secret precautions that have been taken.

    Ten From Infinity

    Paul W. Fairman

  • I've got some news for you concerning that top-secret gadget you told us about.

    Industrial Revolution

    Poul William Anderson

  • A good thing, too, otherwise the enemy would be getting our top-secret information in print all the time.

  • Now it was the Swifts' top-secret rocket base, tightly guarded by drone planes and radar.

  • Senator Crane, a doggedly determined man, had listened to the replay of Brent Taber's top-secret conference again and again.

    Ten From Infinity

    Paul W. Fairman

British Dictionary definitions for top-secret


  1. containing information whose disclosure would cause exceedingly grave damage to the nation and therefore classified as needing the highest level of secrecy and security
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012