To examine information, following a systematic, predetermined sequence, for some particular purpose.

The motion, usually periodic, given to the major lobe of an antenna; the process of directing the radio-frequency beam successively over all points in a given region of space.

1. To examine an area, a region in space, or a portion of the radio spectrum point by point in an ordered sequence; for example, conversion of a scene or image to an electric signal or use of radar to monitor an airspace for detection, navigation, or traffic control purposes.

2. One complete circular, up-and-down, or left-to-right sweep of the radar, light, or other beam or device used in making a scan.