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[ree-juh n] /ˈri dʒən/
an extensive, continuous part of a surface, space, or body:
a region of the earth.
Usually, regions. the vast or indefinite entirety of a space or area, or something compared to one:
the regions of the firmament; the regions of the mind.
a part of the earth's surface (land or sea) of considerable and usually indefinite extent:
a tropical region.
a district without respect to boundaries or extent:
a charming region in Connecticut.
a part or division of the universe, as the heavens:
a galactic region.
a large indefinite area or range of something specified; sphere:
a region of authority.
an area of interest, activity, pursuit, etc.; field:
studies in the region of logic.
an administrative division of a city or territory.
Zoogeography. a major faunal area of the earth's surface, sometimes one regarded as a division of a larger area.
Anatomy. a place in or a division of the body or a part of the body:
the abdominal region.
  1. Also called domain. an open connected set.
  2. the union of such a set and some or all of its boundary points.
Origin of region
1300-50; Middle English < Anglo-French regiun < Latin regiōn- (stem of regiō) direction, line, boundary, equivalent to reg(ere) to rule + -iōn- -ion
Related forms
underregion, noun
1. area, section, portion. 4. locale, site, tract, quarter. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for region


any large, indefinite, and continuous part of a surface or space
an area considered as a unit for geographical, functional, social, or cultural reasons
an administrative division of a country: Tuscany is one of the regions of the Italian Republic
a realm or sphere of activity or interest
range, area, or scope: in what region is the price likely to be?
a division or part of the boday: the lumbar region
(in Scotland from 1975 until 1996) any of the nine territorial divisions into which the mainland of Scotland was divided for purposes of local government; replaced in 1996 by council areas See also islands council
Word Origin
C14: from Latin regiō, from regere to govern
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for region

c.1300, "tract of land of a considerable but indefinite extent," from Anglo-French regioun, Old French region "land, region, province" (12c.), from Latin regionem (nominative regio) "a district, portion of a country, territory, district; a direction, line; boundary line, limit," noun of state from past participle stem of regere "to direct, rule" (see regal). Phrase in the region of "about" (of numbers, etc.) is recorded from 1961.

Online Etymology Dictionary, © 2010 Douglas Harper
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region in Medicine

region re·gion (rē'jən)

  1. An area of the body having natural or arbitrary boundaries.

  2. A portion of the body having a special nervous or vascular supply.

  3. A part of an organ with a special function.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Idioms and Phrases with region
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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