Any of the five regions of the surface of the Earth that are loosely divided according to prevailing climate and latitude, including the Torrid Zone, the North and South Temperate zones, and the North and South Frigid zones.
Ecology An area characterized by distinct physical conditions and populated by communities of certain kinds of organisms.
Mathematics A portion of a sphere bounded by the intersections of two parallel planes with the sphere.
Anatomy An area or a region distinguished from adjacent parts by a distinctive feature or characteristic.
Geology A region or stratum distinguished by composition or content.