counterintelligence


coun·ter·in·tel·li·gence

noun \ˌkan-tər-in-ˈte-lə-jən(t)s\

: activity meant to hide the truth from an enemy or to prevent the enemy from learning secret information

Full 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

1940

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