counterintelligence
noun
- Activities aimed to protect intelligence operations from enemy intelligence agencies
Wiktionary
noun
Etymology: Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Proto-Indo-European *-teros Proto-Italic *-teros Proto-Italic *komterosder. Proto-Italic *komterād Latin contrāder. Old French contre- Anglo-Norman countre-bor. Middle English counter- English counter- English intelligence English counterintelligence From counter- + intelligence.
- counterespionage