SCADA is the acronym for Supervisory Control And Data Acquisition. In North America, SCADA refers to a large-scale, distributed measurement and control system, while in the rest of the world SCADA may describe systems of any size or geographical distribution. SCADA systems are typically used to perform data collection and control at the supervisory level. Some systems are called SCADA despite only performing data acquisition and not control.
Wikipedia page: SCADA.