[n] electronic equipment that provides visual images of varying electrical quantities
[n] a magnifier of images of distant objects
[n] an area in which something acts or operates or has power or control: "the range of a supersonic jet"; "the ambit of municipal legislation"; "within the compass of this article"; "within the scope of an investigation"; "outside the reach of the law"; "in the political orbit of a world power"
[n] the state of the environment in which a situation exists; "you can't do that in a university setting"
ambit, background, cathode-ray oscilloscope, compass, CRO, orbit, oscilloscope, range, reach, setting, telescope