counterespionage

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counterespionage /ˌkaʊntɚˈɛspijəˌnɑːʒ/ noun
counterespionage
/ˌkaʊntɚˈɛspijəˌnɑːʒ/
noun
Learner's definition of COUNTERESPIONAGE
[noncount] formal
: the activity of preventing or stopping enemies from spying