What is AMBIT? Definition of AMBIT in Black's Law Dictionary
A boundary line, as going around a place; an exterior or inclosing line or limit. Ellicott v. Pearl, 10 Pet., U.S., 412, 442, 9 L.Ed. 475.
The limits or circumference of a power or jurisdiction; the line circumscribing any subject-matter. As to the ambit of a port, see Leonis Steamship Co.; Ltd., v. Rank, Ltd.,  1 K.B. 344, 352; Pyman Bros. v. Dreyfus Bros. & Co.  24 Q.B.D. 152, 155.