What does espionage mean?
Espionage is the practice of secretly collecting confidential information about a rival state, organization, or business through spies and covert operations. The term is most strongly associated with international affairs — governments use espionage to learn about other nations' military capabilities, political intentions, and technological developments — but it also applies to the commercial world, where 'corporate' or 'industrial' espionage involves stealing trade secrets. Espionage is typically carried out by trained intelligence agents, though it may involve informants, surveillance technology, or cyber intrusions. The word is formal in register and appears frequently in news reporting, legal proceedings, and historical writing; ordinary conversation usually prefers the simpler word 'spying'. Because it implies deception and secrecy, espionage carries inherently negative connotations when attributed to adversaries, while nations tend to describe their own activities more neutrally as intelligence work. Related terms include counter-espionage, which refers to measures designed to detect and thwart enemy spies.
nounThe practice of spying or of using spies to obtain secret information about the military, political, or industrial activities of a rival nation, organization, or company.
- The practice of obtaining secret information about a rival nation or organization through spies and covert methods, especially in matters of national security.
"He was convicted of espionage for passing classified documents to a foreign government."
"During the Cold War, both superpowers conducted extensive espionage against each other."
"The company sued its former employee for corporate espionage after trade secrets appeared in a competitor's product."
Rarely pluralized; the uncountable singular form is standard in almost all contexts.
"Historians have documented numerous espionage campaigns across the century."
The word 'espionage' comes from a Germanic root that also gave us 'spy' — meaning that spies have been hiding inside our vocabulary all along.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of espionage
Espionage entered English in the late 18th century, borrowed directly from French espionnage, which derives from espionner ('to spy'), itself formed from espion ('spy'). The French verb traces back through Old French espier ('to watch, observe') to a Germanic root that is also the ancestor of the English words 'spy' and 'espy', making those words true etymological cousins of espionage despite their different-looking forms.
How espionage is actually used
A formal register word used chiefly in journalism, law, politics, and history. In everyday speech people more often say 'spying'. It carries serious connotations — criminal charges of espionage can carry severe penalties. Common modifiers include 'industrial', 'corporate', 'economic' (for commercial contexts) and 'counter-espionage' (measures taken against it).
Easily confused with espionage
Espionage specifically means covert spying to obtain secrets, while intelligence is the broader field of gathering and analyzing information by both open and secret means.