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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

psychological feature go
a feature of the mental life of a living organism

event go
something that happens at a given place and time

act, deed, human action, human activity go
something that people do or cause to happen

activity go
any specific behavior

work go
activity directed toward making or doing something

investigation, investigating go
the work of inquiring into something thoroughly and systematically

police work, police investigation go
the investigation of criminal activities

surveillance
close observation of a person or group (usually by the police)

noun.act

4 Subcategories

electronic surveillance go
surveillance by electronic means (e.g. television)
watch, vigil go
a purposeful surveillance to guard or observe
stakeout go
surveillance of some place or some person by the police (as in anticipation of a crime)
surveillance of disease go
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