ambit (
http://definr.com/ambit)
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" [syn:
scope,
range,
reach,
orbit,
compass]