surveillance

noun

sur·​veil·​lance sər-ˈvā-lən(t)s 

also

-ˈvāl-yən(t)s 

or

-ˈvā-ən(t)s 

: close watch kept over someone or something (as by a detective)

also : supervision see also immune surveillance

Synonyms

• stewardship
• supervision
• oversight
• management
• control
• policing
• regulation

Examples of surveillance in a Sentence

government surveillance of suspected terrorists

The bank robbery was recorded by surveillance video cameras.

Recent Examples on the Web

Drummond, who was considered armed and dangerous, was recently captured on surveillance footage amid the high-profile search to track him down. —Taylor Ardrey, USA Today, 5 Aug. 2025

Combs was physically violent on numerous occasions with Ventura, and photographic and video evidence of her being assaulted was shown to the jury throughout the trial, including 2016 hotel surveillance footage of Combs beating Ventura, which was first published by CNN in May 2024. —Elizabeth Wagmeister, CNN Money, 5 Aug. 2025

He was last seen in surveillance footage wearing few clothes and no shoes. —David Zimmermann, The Washington Examiner, 3 Aug. 2025

Satellites provide essential capabilities for military communication, surveillance, navigation and intelligence. —Mojtaba Akhavan-Tafti, Space.com, 3 Aug. 2025

Word History

Etymology

French, from surveiller to watch over, from sur- + veiller to watch, from Old French veillier, from Latin vigilare, from vigil watchful — more at vigil

First Known Use

1802, in the meaning defined above

Phrases Containing surveillance

• counter-surveillance
• electronic surveillance
• immune surveillance
• immunological surveillance
• keep under surveillance

Kids Definition

surveillance

noun

sur·​veil·​lance sər-ˈvā-lən(t)s 

 also  -ˈvāl-yən(t)s,

 or  -ˈvā-ən(t)s

: close watch

under surveillance

Medical Definition

surveillance

noun

sur·​veil·​lance

sər-ˈvā-lən(t)s also -ˈvāl-yən(t)s or -ˈvā-ən(t)s

: close and continuous observation or testing

serological surveillance

see immune surveillance