Part of speech: noun

The practise of spying, as to secure military information; offensive surveillance.

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Usage examples "espionage":

  1. This constant espionage gets on one's nerves. - "The Box with the Broken Seals", E. Phillips Oppenheim.
  2. Madame Bonaparte called this business a vile system of espionage. - "The Project Gutenberg Memoirs of Napoleon Bonaparte", Bourrienne, Constant, and Stewarton.
  3. It was clear that, having found a new opportunity to exercise his mania for espionage, he had availed himself of it to the utmost; perhaps, too, there was at the bottom of it all a vague, carefully concealed rage against his little Chebe, the anger of a senile passion never declared. - "Fromont and Risler, Complete", Alphonse Daudet Last Updated: March 3, 2009.