Etymology
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espionage (n.)

1793, from French espionnage "spying," from espionner "to spy," from espion "a spy" (16c.), probably via Old Italian spione from a Germanic source akin to Old High German spehon "to spy" (see spy (v.)). For initial e- see e-. Middle English had espiouress "female spy" (early 15c.).

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Definitions of espionage

espionage (n.)
the systematic use of spies to get military or political secrets;
From wordnet.princeton.edu