1. Of or associated with a zone.
2. Divided into zones.
3. Geology. Of or relating to soil characterized by well-developed horizons, reflecting the type of vegetation the soil supports and the climate to which it is exposed.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.