coun·ter·in·tel·li·gence | \ˌkau̇n-tər-in-ˈte-lə-jən(t)s \

Definition of counterintelligence 

: organized activity of an intelligence service designed to block an enemy's sources of information, to deceive the enemy, to prevent sabotage, and to gather political and military information

Examples of counterintelligence in a Sentence

Recent Examples on the Web

Why doesn't the president ask his director of National Intelligence, Dan Coats, to look into the counterintelligence side of this? Fox News, "Preparations for a Trump-Kim summit getting back on track," 3 June 2018 The document includes more than 25 recommendations related to elections and cybersecurity, counterintelligence practices and campaign finance rules. Nicholas Fandos, New York Times, "Despite Mueller’s Push, House Republicans Declare No Evidence of Collusion," 12 Mar. 2018 The document includes more than 25 recommendations related to elections and cybersecurity, counterintelligence practices, and campaign finance rules. Nicholas Fandos,, "GOP report finds no collusion between Trump and Russia in 2016," 12 Mar. 2018 Its primary roles include political, economic and counterintelligence, the European Council on Foreign Relations (ECFR) explains. Madeline Farber, Fox News, "What's the GRU, Russia's military intelligence agency? 3 things to know," 13 July 2018 Strzok, a deputy assistant director at the FBI who oversaw counterintelligence cases, was removed from the Trump probe by Mueller in July 2017., "FBI agent Strzok feuds with GOP critics at hearing," 13 July 2018 Those texts, exchanged between senior counterintelligence agent Peter Strzok and bureau attorney Lisa Page, fuel claims by Trump and his GOP allies in Congress that the FBI and Justice Department are biased against Trump. Erin Kelly, USA TODAY, "House Republicans tie watchdog report on Clinton email case to credibility of Russia probe," 19 June 2018 The meeting took place two months earlier than federal officials have said a counterintelligence operation was officially opened and before WikiLeaks began releasing hacked Democratic emails. Anchorage Daily News, "Trump associate Roger Stone reveals new contact with Russian national during 2016 campaign," 17 June 2018 Strzok was a respected, veteran counterintelligence agent who helped lead that investigation. Chicago Tribune,, "FBI report: Anti-Trump texts 'cast a cloud' over email probe," 15 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'counterintelligence.' 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 counterintelligence

1940, in the meaning defined above

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Last Updated

3 Oct 2018

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The first known use of counterintelligence was in 1940

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English Language Learners Definition of counterintelligence

: activity meant to hide the truth from an enemy or to prevent the enemy from learning secret information

Comments on counterintelligence

What made you want to look up counterintelligence? Please tell us where you read or heard it (including the quote, if possible).


to reject or criticize sharply

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