sur·veil·lance

[ser-vey-luhns, -veyl-yuhns]
noun
1.
a watch kept over a person, group, etc., especially over a suspect, prisoner, or the like: The suspects were under police surveillance.
2.
supervision or superintendence.

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

coun·ter·sur·veil·lance, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
surveillance (sɜːˈveɪləns) [Click for IPA pronunciation guide]
 
n
close observation or supervision maintained over a person, group, etc, esp one in custody or under suspicion
 
[C19: from French, from surveiller to watch over, from sur-1 + veiller to keep watch (from Latin vigilāre; see vigil)]
 
sur'veillant
 
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Surveillance is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

surveillance
1802, from Fr. surveillance "oversight, supervision, a watch," noun of action from surveiller "oversee, watch," from sur- "over" + veiller "to watch," from L. vigilare, from vigil "watchful" (see vigil). Seemingly a word of the Terror in France. A hideous back-formation, surveille
(v.), was coined in 1960 in U.S. government jargon. Pray that it dies.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

surveillance sur·veil·lance (sər-vā'ləns)
n.

  1. Close observation of a person or group, especially one under suspicion.

  2. The act of observing or the condition of being observed.

  3. The collection, collation, analysis, and dissemination of data.

  4. 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.
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Example sentences
These programs could enormously increase the surveillance powers of governments.
Such blimps can keep surveillance and ordnance-guiding equipment aloft for a
  few hundred dollars an hour.
Perry's program is not the first to employ video technology in the service of
  community surveillance.
The less-obtrusive vessel could be used for research and surveillance.
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