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counterintelligence

[koun-ter-in-tel-i-juh ns]
noun
  1. the activity of an intelligence service employed in thwarting the efforts of an enemy's intelligence agents to gather information or commit sabotage.
  2. an organization engaged in counterintelligence.
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Origin of counterintelligence

First recorded in 1935–40; counter- + intelligence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for counterintelligence

counterintelligence

noun
  1. activities designed to frustrate enemy espionage
  2. intelligence collected about enemy espionage
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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

Word Origin and History for counterintelligence

n.

also counter-intelligence, 1940, from counter- + intelligence.

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Online Etymology Dictionary, © 2010 Douglas Harper