counterintelligence

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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.