spy noun definition in Terrorism topic from the Oxford Advanced Learner's Dictionary

spy

 noun: Terrorism topic
(pl. spies) a person who tries to get secret information about another country, organization or person, especially somebody who is employed by a government or the police He was denounced as a foreign spy. a police spy a spy plane/satellite (= used to watch the activities of the enemy) Video spy cameras are being used in public places.

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