Jisho

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Noun
1. counterintelligence; counterespionage
Wikipedia definition
2. CounterintelligenceThis article is a subset article of intelligence cycle security. Counterintelligence or counter-intelligence (CI) refers to efforts made by intelligence organizations to prevent hostile or enemy intelligence organizations from successfully gathering and collecting intelligence against them. National intelligence programs, and, by extension, the overall defenses of nations, are vulnerable to attack.
Read “Counterintelligence” on English Wikipedia
Read “防諜” on Japanese Wikipedia
Read “Counterintelligence” on DBpedia

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