surveillance
Americannoun
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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.
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continuous observation of a place, person, group, or ongoing activity in order to gather information.
video cameras used for covert surveillance.
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attentive observation, as to oversee and direct someone or something.
increased surveillance of patients with chronic liver disease.
noun
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Etymology
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
Explanation
Many times, a person suspected of something illegal by the authorities is placed under surveillance, meaning he or she is closely watched to see if their suspicions are well-founded. If you break down the word surveillance you get the prefix sur, from the French word for "over" and the root veiller, meaning "to watch." All of which is a roundabout way of saying that if you are under surveillance, you are being closely watched — usually by the authorities, and usually not for a good reason! Those surveillance cameras in banks and stores are put there in the hopes of both preventing crimes and recognizing criminals after a crime has been committed.
Vocabulary lists containing surveillance
John F. Kennedy's Address to the American People on the Cuban Missile Crisis (1962)
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This Week In Words: August 1–6, 2020
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National Spelling Bee '14: Prelims Round 2
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The point of mass surveillance in the kind of Larry Ellison sense — “you’re always being watched, so you’re on your best behavior” — is that you’re always terrified into compliance.
From Salon • Jun. 22, 2026
Many California counties do not employ a single defense investigator who can interview witnesses, review police reports, visit crime scenes and retrieve video surveillance footage.
From Los Angeles Times • Jun. 21, 2026
The group, which includes the Index on Censorship and Big Brother Watch, is concerned that various forms of surveillance, as it considers this to be, limit rights to freedom of expression for children and adults.
From BBC • Jun. 20, 2026
That fight exploded in January over who gets to limit applications of AI in combat and surveillance, and escalated over the weekend.
From The Wall Street Journal • Jun. 19, 2026
Over the past few months Kelton’s family has assembled an over-the-top surveillance system, set up a mini greenhouse in their side yard, and lined their entire roof with some kind of unregistered, off-grid solar panels.
From "Dry" by Neal Shusterman and Jarrod Shusterman
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
