counter-intelligencen.
The activity of preventing the enemy from obtaining secret information; the agency or service engaged in this activity; = counter-espionage n. Also attributive.
ΘΚΠ
the mind > attention and judgement > enquiry > investigation, inspection > secret observation, spying > counter-espionage > [noun]
counter-espionage1899
contre-espionnage1919
counter-intelligence1940
phylactology1966
1940 S. Thomas S-2 in Action 119 These are but the elementals of counter-intelligence.
1949 J. F. Embree in M. Fortes Social Struct. 216 Members of various divisions..concerned with such matters as counter-intelligence.
1955 Bull. Atomic Scientists Apr. 130/2 The threat of espionage must be assessed for what it is, and countermeasures taken by security and counterintelligence.
1957 New Yorker 26 Oct. 106/2 Investigation by counter-intelligence officers.
This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2019).
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n.1940