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Definition of Spy
1. Verb. Catch sight of.
Generic synonyms: Sight
Derivative terms: Espial, Spotter, Spotter, Spotting, Spying
2. Noun. (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors.
Category relationships: Armed Forces, Armed Services, Military, Military Machine, War Machine
Specialized synonyms: Counterspy, Mole, Double Agent, Espionage Agent, Foreign Agent, Infiltrator, Sleeper
Generic synonyms: Intelligence Agent, Intelligence Officer, Operative, Secret Agent
Specialized synonyms: Margarete Gertrud Zelle, Mata Hari
3. Verb. Watch, observe, or inquire secretly.
Entails: Enquire, Inquire, Investigate
Generic synonyms: Monitor, Supervise
Derivative terms: Sleuth, Sleuthing, Snoop, Snooper, Spying
4. Noun. A secret watcher; someone who secretly watches other people. "My spies tell me that you had a good time last night"
Generic synonyms: Looker, Spectator, Viewer, Watcher, Witness
5. Verb. Catch sight of; to perceive with the eyes. "He caught sight of the king's men coming over the ridge"
Generic synonyms: Comprehend, Perceive
Specialized synonyms: Descry, Espy, Spot, Detect, Discover, Find, Notice, Observe
Derivative terms: Sight, Sight, Sight, Sight, Sight, Sighting
6. Verb. Secretly collect sensitive or classified information; engage in espionage. "Spy for the Russians"
Definition of Spy
1. v. t. To gain sight of; to discover at a distance, or in a state of concealment; to espy; to see.
2. v. i. To search narrowly; to scrutinize.
3. n. One who keeps a constant watch of the conduct of others.
Definition of Spy
1. Noun. A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage) ¹
2. Verb. (intransitive) To act as a spy. ¹
3. Verb. (transitive) To spot at a distance. ¹
¹ Source: wiktionary.com
Definition of Spy
1. to watch secretly [v SPIED, SPYING, SPIES]
Medical Definition of Spy
1. Origin: See Spy, and cf. Espy. 1. One who keeps a constant watch of the conduct of others. "These wretched spies of wit." 2. A person sent secretly into an enemy's camp, territory, or fortifications, to inspect his works, ascertain his strength, movements, or designs, and to communicate such intelligence to the proper officer. Spy money, money paid to a spy; the reward for private or secret intelligence regarding the enemy. Spy Wednesday, the Wednesday immediately preceding the festival of Easter; so called in allusion to the betrayal of Christ by Judas Iscariot. Synonym: See Emissary, and Scout. Source: Websters Dictionary (01 Mar 1998)