| Noun | 1. | surveillance - close observation of a person or group (usually by the police)police investigation, police work - the investigation of criminal activities electronic surveillance - surveillance by electronic means (e.g. television) stakeout - surveillance of some place or some person by the police (as in anticipation of a crime) surveillance of disease - the ongoing systematic collection and analysis of data about an infectious disease that can lead to action being taken to control or prevent the disease |