any continuous tract or area that differs in some respect, or is distinguished for some purpose, from adjoining tracts or areas, or within which certain distinctive circumstances exist or are established.
Geography. any of five great divisions of the earth's surface, bounded by lines parallel to the equator and named according to the prevailing temperature. Compare North Frigid Zone, North Temperate Zone, South Frigid Zone, South Temperate Zone, Torrid Zone.
Biogeography. an area characterized by a particular set of organisms, whose presence is determined by environmental conditions, as an altitudinal belt on a mountain.
Geology. a horizon.
Geometry. a part of the surface of a sphere included between two parallel planes.
a specific district, area, etc., within which a uniform charge is made for transportation, mail delivery, or other service.
the total number of available railroad terminals within a given circumference around a given shipping center.
an area or district in a city or town under special restrictions as to the type, size, purpose, etc., of existing or proposed buildings.
Also called postal delivery zone. (in the U.S. postal system) any of the numbered districts into which a city or metropolitan area was formerly divided for expediting the sorting and delivery of mail.
Sports. a particular portion of a playing area: The wing was trapped with the puck in his own defensive zone.
Archaic. a girdle or belt; cincture.
verb (used with object), zoned, zoning.
to mark with zones or bands.
to divide into zones, tracts, areas, etc., as according to existing characteristics or as distinguished for some purpose.
to divide (a city, town, neighborhood, etc.) into areas subject to special restrictions on any existing or proposed buildings.
to encircle or surround with a zone, girdle, belt, or the like.
verb (used without object), zoned, zoning.
to be formed into zones.

1490–1500; < Latin zōna < Greek zṓnē belt

zoneless, adjective
interzone, noun
miszone, verb, miszoned, miszoning.
unzone, verb (used with object), unzoned, unzoning.

1. region. See belt. 16. gird, band. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
zone (zəʊn)
1.  a region, area, or section characterized by some distinctive feature or quality
2.  a sphere of thought, disagreement, argument, etc
3.  an area subject to a particular political, military, or government function, use, or jurisdiction: a demilitarized zone
4.  (often capital) geography Torrid Zone Frigid Zone See Temperate Zone one of the divisions of the earth's surface, esp divided into latitudinal belts according to temperature
5.  geology a distinctive layer or region of rock, characterized by particular fossils (zone fossils), metamorphism, structural deformity, etc
6.  ecology an area, esp a belt of land, having a particular flora and fauna determined by the prevailing environmental conditions
7.  maths a portion of a sphere between two parallel planes intersecting the sphere
8.  sport
 a.  a mental state that enables a competitor to perform to the best of his or her ability: Hingis is in the zone at the moment
 b.  (modifier) of or relating to competitive performance that depends on the mood or state of mind of the participant: a zone player
9.  archaic, literary or a girdle or belt
10.  (NZ) a section on a transport route; fare stage
11.  (NZ) a catchment area for pupils for a specific school
12.  in the zone See zone
13.  to divide into zones, as for different use, jurisdiction, activities, etc
14.  to designate as a zone
15.  to mark with or divide into zones
16.  (NZ) to establish (an area) as a zone for a specific school
[C15: from Latin zōna girdle, climatic zone, from Greek zōnē]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1390, from L. zona "geographical belt, celestial zone," from Gk. zone "a belt," related to zonnynai "to gird," from PIE base *yes- "to gird, girdle" (cf. Avestan yasta- "girt," Lith. juosiu "to gird," O.C.S. po-jasu "girdle"). Originally one of the five great divisions of the earth's surface (torrid,
temperate, frigid; separated by tropics of Cancer and Capricorn and Arctic and Antarctic circles); meaning "any discrete region" is first recorded 1822. Zone defense in team sports is recorded from 1927. Zoning "land-use planning" is recorded from 1912. Zoned (adj.) in drug-use sense is attested 1960s, from ozone, which is found high in the atmosphere; the related verb to zone is from 1980s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

zone (zōn)

  1. An area or a region distinguished from adjacent parts by a distinctive feature or characteristic.

  2. See zona.

  3. A segment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
zone   (zōn)  Pronunciation Key 

(click for larger image in new window)

  1. 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.

  2. Ecology An area characterized by distinct physical conditions and populated by communities of certain kinds of organisms.

  3. Mathematics A portion of a sphere bounded by the intersections of two parallel planes with the sphere.

  4. Anatomy An area or a region distinguished from adjacent parts by a distinctive feature or characteristic.

  5. Geology A region or stratum distinguished by composition or content.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

zone definition

A logical group of network devices on AppleTalk.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Everyone should find their comfort zone with technology and work within their
  strengths and personal styles.
Stepping out of comfort zone is a huge challenge for students.
But their comfort zone is furnished with self-deception.
All of that will take this introvert pretty far outside his comfort zone.
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