Surveillance
WordNet
noun
(1) Close observation of a person or group (usually by the police)
WiktionaryText
Noun
- Close observation of an individual or group, especially one under suspicion
- Continuous monitoring of disease occurrence for example
- Systematic observation of places and people by visual, aural, electronic, photographic or other means.
- In criminal law, an investigation process by which police gather evidence about crimes, or suspected crime, through continued observation of persons or places.