(n.) The practice or employment of spies; the practice of watching the words and conduct of others, to make discoveries, as spies or secret emissaries; secret watching.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). espionage. Retrieved September 22, 2026, from http://smartdefine.org/espionage/definitions/2004817 |
| Chicago | Webster's. 2011. "espionage" http://smartdefine.org/espionage/definitions/2004817 (accessed September 22, 2026). |
| Harvard | Webster's 2011, espionage, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/espionage/definitions/2004817>. |
| MLA | Webster's. "espionage" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/espionage/definitions/2004817> |