counterintelligence

[ koun-ter-in-tel-i-juhns ]
/ ˌkaʊn tər ɪnˈtɛl ɪ dʒəns /

noun

the activity of an intelligence service employed in thwarting the efforts of an enemy's intelligence agents to gather information or commit sabotage. Abbreviation: CI
an organization engaged in counterintelligence. Abbreviation: CI

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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. 2020

Example sentences from the Web for counterintelligence

British Dictionary definitions for counterintelligence

counterintelligence
/ (ˌkaʊntərɪnˈtɛlɪdʒəns) /

noun

activities designed to frustrate enemy espionage
intelligence collected about enemy espionage
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