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
First Known Use of counterintelligence
COUNTERINTELLIGENCE Defined for English Language Learners
Definition of counterintelligence for English Language Learners
: activity meant to hide the truth from an enemy or to prevent the enemy from learning secret information
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