Espionage is defined as the act of spying or the use of spies by a government or a company.(verb)
An example of espionage is when a spy infiltrates the government of another country to learn valuable state secrets.
See espionage in Webster's New World College Dictionary
Origin: Fr espionnage < espionner, to spy < espion < It spione < spia, spy < Gmc *speha, akin to OHG spehon: see spy
See espionage in American Heritage Dictionary 4
Origin: French espionnage
Origin: , from espionner, to spy
Origin: , from Old French espion, spy
Origin: , from Old Italian spione, of Germanic origin; see spek- in Indo-European roots.
Learn more about espionage