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surveillance

ser-VAY-lunss /sərˈveɪ.ləns/

nounC1GREIELTSTOEFL

academicformal

Close observation, especially of a suspected person or continuous monitoring of a designated area.

Carries distinct connotations of official oversight, security control, or potential intrusion into personal privacy.

The story behind the word. Imported into English during the French Revolution, 'surveillance' comes from French 'sur-' (over) and 'veiller' (to watch, from Latin 'vigilare'—the root of 'vigilant'). It literally translates to 'watching over from above'.

Word relationships

monitoring: A broader, neutral term applying to environmental metrics or system health without privacy implications.
scrutiny: Refers to critical examination or careful inspection rather than visual or physical watching.

privacy: Freedom from public observation or unauthorized intrusion.
neglect: Failing to pay attention to or observe an area or individual.

Commonly confused with

monitoring: Monitoring can be constructive or environmental (e.g. water safety); surveillance emphasizes security control over individuals.

Word family

surveil (verb): To keep a person or place under surveillance.
surveillance-state (noun): A state enforcing intrusive monitoring over its citizens.

Collocations

mass surveillance
video surveillance
surveillance camera
under surveillance

Example sentences

"Citizens voiced concerns over expanding facial recognition surveillance cameras across public parks and subway stations." Civil liberties debate
"The port authority installed high-definition video surveillance along the waterfront to detect unauthorized entry." Urban security strategy

Memory hook

SUR-VEIL-lance: An eye watching over (SUR) behind a secret VEIL. The watchful eye watching from above.

When not to use

Do not use for casual or friendly watching; surveillance implies systematic or authoritative monitoring.

Fun facts

During the Reign of Terror in revolutionary France, local 'Committees of Surveillance' were formed to track foreign visitors and political dissidents.