top secret


Definition of top secret 

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

2a : 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

The downgrading of his interim clearance from top secret to secret was first reported by Politico. Shane Harris, Washington Post, "Kushner’s overseas contacts raise concerns as foreign officials seek leverage," 6 Mar. 2018 The downgrading of his interim clearance from top secret to secret was first reported by Politico. Washington Post,, "Kushner’s overseas contacts raise concerns as foreign officials seek leverage," 28 Feb. 2018 Both have received top secret briefings on the matter. James Hohmann, Washington Post, "The Daily 202: Why Bernie Sanders won’t join the Democratic Party," 7 June 2018 But Northrop Grumman is now conducting tests as part of the Pentagon's top secret efforts to develop hypersonic weapons that can fly longer and farther. David Martin, CBS News, "Inside the global race to develop hypersonic weapons," 13 July 2018 Meanwhile, ten members of the president’s National Security Council had not been approved for permanent access to top secret information. Eric Levitz, Daily Intelligencer, "Scores of White House Staffers Still Lack a Full Security Clearance," 15 Feb. 2018 House Intelligence Committee Chairman Devin Nunes meanwhile and Trey Gowdy headed to the Department of Justice for information about a top secret intelligence source involved in the Mueller probe. Fox News, "Rep. Michael McCaul on Iran deal flaws, immigration policy," 14 May 2018 As far as the Polka Parade is concerned, the City's float contribution — in which Mayor Joe Stahura always has a huge hand — remains top secret, according to Dabertin. Michelle L. Quinn,, "Whiting's Pierogi Fest celebrates its 24th — or 25th — year," 13 May 2018 The British, just like the Germans, are excellent chemists who can with one hint do what in Moscow is classified as top secret. Brendan Cole, Newsweek, "Russian Novichok Developer Says There Is No Antidote so Sergei Skripal and His Daughter Will Die," 21 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'top secret.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of top secret

1944, in the meaning defined at sense 1

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Last Updated

19 Oct 2018

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Time Traveler for top secret

The first known use of top secret was in 1944

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More Definitions for top secret

top secret


English Language Learners Definition of top secret

: kept completely secret by high government officials

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Spanish Central: Translation of top secret

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something that serves to warn or remind

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