ambit \AM-bit\, noun:
1. Circuit or compass.
2. The boundaries or limits of a district or place.
3. An area in which something acts, operates, or has power or control; extent; sphere; scope.
Ambit is from Latin ambitus, "circuit," from ambire, "to go around," from amb-, "about, around" + ire, "to go."
The Department of Enterprise wanted a regulatory regime completely outside the ambit of the Central Bank.
-- Christine Newman, "Departments were having 'turf war', committee told", Irish Times, November 29, 2000