espionage

noun

es·​pi·​o·​nage ˈe-spē-ə-ˌnäzh  -ˌnäj 

-nij,

 Canadian also  -ˌnazh;

ˌe-spē-ə-ˈnäzh;

i-ˈspē-ə-nij

: the practice of spying or using spies to obtain information about the plans and activities especially of a foreign government or a competing company

industrial espionage

Synonyms

• spying

Examples of espionage in a Sentence

He was charged with several counts of espionage.

the acts of espionage on behalf of the Confederacy carried on by Belle Boyd and Rose Greenhow

Recent Examples on the Web

Jurors convicted Lee of espionage, nonetheless, and a judge gave him a life term. —Christopher Goffard, Los Angeles Times, 29 May 2025

Though there’s no explicit mention of the Cold War, there’s plenty of espionage and intrigue. —Richard Brody, New Yorker, 29 May 2025

The enchanting espionage comedy flaunts an excellent Benicio del Toro as a 1950s industrialist, who, after surviving an attempt on his life, names his estranged daughter Liesl (Mia Threapleton) as heir to his empire. —David Rooney, HollywoodReporter, 24 May 2025

Every few years, Tom Cruise leads a new chapter in the life of globetrotter Ethan Hunt and his team of agents, who aren’t afraid of missions deemed too difficult for traditional means of espionage. —Will Harris, EW.com, 23 May 2025

Word History

Etymology

French espionnage, from Middle French, from espionner to spy, from espion spy, from Old Italian spione, from spia, of Germanic origin; akin to Old High German spehōn to spy — more at spy

First Known Use

1793, in the meaning defined above

Kids Definition

espionage

noun

es·​pi·​o·​nage ˈes-pē-ə-ˌnäzh  -näj 

-ˌnij

: the practice of spying : the use of spies

Legal Definition

espionage

noun

es·​pi·​o·​nage ˈes-pē-ə-ˌnäzh, -ˌnäj, -nij 

: the practice of gathering, transmitting, or losing through gross negligence information relating to the defense of the U.S. with the intent that or with reason to believe that the information will be used to the injury of the U.S. or the advantage of a foreign nation