Dictionary

counterespionage

noun coun·ter·es·pi·o·nage \ˌkan-tər-ˈes-pē-ə-ˌnäzh, -ˌnäj, -nij, Canada also -ˌnazh; -ˌes-pē-ə-ˈnäzh; -ə-ˈspē-ə-nij\

: the activity of preventing or stopping enemies from spying

Full Definition of COUNTERESPIONAGE

:  the activity concerned with detecting and thwarting enemy espionage
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Examples of COUNTERESPIONAGE

  1. He was involved in counterespionage against Germany in World War II.

First Known Use of COUNTERESPIONAGE

1899

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