term:

Zone

zone n

:

a specifically designated section of a larger area or territory: as
a : a section of a municipality controlled by specific restrictions on permitted use (as for residences or agriculture)
b : a distance within which the same fare is charged by a common carrier
c : a stretch of roadway or a space within which certain traffic regulations are in force
vt zoned
zon·ing
1 a : to partition (as a city or town) by ordinance into sections reserved for different purposes (as residence or business)
b : to designate the permitted use of (property) by placement in a municipal zone [land zoned for agricultural use]
2 : to restrict different kinds of (use) to different areas [the power to land use within its borders]

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.