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
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 U.S. withdrawal from international agencies and the strain USAID’s end put on surveillance and response systems were key to allowing Ebola to spread unchecked, several experts told me.
From Slate • Jun. 9, 2026
Past screwworm outbreaks imposed major rancher losses beyond cattle deaths, including surveillance and treatment costs, according to Ethan Dixon and Mariam Yousuf, research analysts at the federal bank.
From Barron's • Jun. 8, 2026
With access to the satellite images, his team didn’t have to rely on surveillance drones that can be expensive and are more easily jammed or shot down by the Russians.
From The Wall Street Journal • Jun. 5, 2026
Rather than focusing on a single virus strain, the AI system analyzed genetic information from Sarbeco coronaviruses collected through surveillance programs worldwide.
From Science Daily • Jun. 5, 2026
Did her lack of training blind her to KGB surveillance?
From "Spies: The Secret Showdown Between America and Russia" by Marc Favreau
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.
