Definition of counterintelligence noun from the Oxford Advanced American Dictionary

 

counterintelligence

 noun
noun
NAmE//ˌkaʊntərɪnˈtɛlədʒəns//
 
[uncountable]
 
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secret action taken by a country to prevent an enemy country from finding out its secrets, for example by giving them false information; the department of a government, etc. that is responsible for this