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English definition of “surveillance”

surveillance

noun [U]     /səˈveɪ.ləns/ US  /sɚ-/
the careful watching of a person or place, especially by the police or army, because of a crime that has happened or is expected: The police have kept the nightclub under surveillance because of suspected illegal drug activity. More banks are now installing surveillance cameras.Using the eyesEyesight, glasses and lensesThe eye and surrounding areaPerceptiveRelating to detection and solving crimes
(Definition of surveillance noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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