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

the activity of an service employed in thwarting the efforts of an enemy’s agents to gather information or commit sabotage.
an organization engaged in counterintelligence.
activities designed to frustrate enemy espionage
intelligence collected about enemy espionage

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


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