Etymology
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counterintelligence (n.)

also counter-intelligence, "act of preventing an enemy from obtaining secret information," 1940, from counter- + intelligence.

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Definitions of counterintelligence

counterintelligence (n.)
intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism;
From wordnet.princeton.edu