counterespionage

/ˌkaʊntərˈɛspiəˌnɑʒ/
noun
  1. Activities designed to prevent or detect spying by an enemy or competitor.
    • Counterespionage efforts increased after the leak of classified documents.
    • He worked in counterespionage, protecting government secrets from enemy agents.
    • The agency's counterespionage unit uncovered a foreign spy ring.
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