[ ser-vey-luhns, -veyl-yuhns ]
/ sərˈveɪ ləns, -ˈveɪl yəns /
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a watch kept over a person, group, etc., especially over a suspect, prisoner, or the like: The suspects were under police surveillance.
continuous observation of a place, person, group, or ongoing activity in order to gather information: video cameras used for covert surveillance.See also electronic surveillance.
attentive observation, as to oversee and direct someone or something: increased surveillance of patients with chronic liver disease.
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Origin of surveillance

1790–1800; <French, equivalent to surveill(er) to watch over (sur-sur-1 + veiller<Latin vigilāre to watch; see vigil) + -ance-ance

OTHER WORDS FROM surveillance

coun·ter·sur·veil·lance, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use surveillance in a sentence

British Dictionary definitions for surveillance

/ (sɜːˈveɪləns) /

close observation or supervision maintained over a person, group, etc, esp one in custody or under suspicion

Derived forms of surveillance

surveillant, adjective, noun

Word Origin for surveillance

C19: from French, from surveiller to watch over, from sur- 1 + veiller to keep watch (from Latin vigilāre; see vigil)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for surveillance

[ sər-vāləns ]

Close observation of a person or group, especially one under suspicion.
The act of observing or the condition of being observed.
The collection, collation, analysis, and dissemination of data.
A type of observational study that involves continuous monitoring of disease occurrence within a population.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.