[ad_1] noun
  1. the act or practice of spying.
  2. the use of spies by a government to discover the military and political secrets of other nations.
  3. the use of spies by a corporation or the like to acquire the plans, technical knowledge, etc., of a competitor: industrial espionage.


  1. the systematic use of spies to obtain secret information, esp by governments to discover military or political secrets
  2. the act or practice of spying

1793, from French espionnage “spying,” from Middle French espionner “to spy,” from Old French espion “spy,” probably via Italian spione from a Germanic source akin to Old High German spehon “spy” (see spy).


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