surveillance

[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

countersurveillance, noun
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World English Dictionary
surveillance (sɜːˈveɪləns)
 
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

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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
The puzzle's author, a schoolmaster, was placed under surveillance.
Perry's program is not the first to employ video technology in the service of
  community surveillance.
We've certainly helped by providing surveillance and reconnaissance.
And, due to some extraordinary feats of surveillance, the researchers know
  precisely which strains of bacteria need to be stopped.
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