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regional

[ree-juh-nl]
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adjective
  1. of or relating to a region of considerable extent; not merely local: a regional meeting of the Boy Scouts.
  2. of or relating to a particular region, district, area, or part, as of a country; sectional; local: regional differences in pronunciation.
  3. Medicine/Medical, Anatomy. pertaining to, affecting, or localized in a particular area or part of the body: regional anesthesia.
  4. having, exhibiting, or characterized by regionalism: He writes regional novels.
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noun
  1. Often regionals. a regional competition or tournament: The basketball team won the regionals.
  2. a regional company, branch, stock exchange, etc.: Regionals are getting stiff competition from the national firms.
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Origin of regional

From the Latin word regiōnālis, dating back to 1645–55. See region, -al1
Related formsre·gion·al·ly, adverbin·ter·re·gion·al, adjectivein·ter·re·gion·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interregional

interregional

adjective
  1. of, relating to, or conducted between two or more regions
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regional

adjective
  1. of, characteristic of, or limited to a regionthe regional dialects of English
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Derived Formsregionally, adverb
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

Word Origin and History for interregional

regional

adj.

early 15c., from Late Latin regionalis "of or belonging to a region or province," from stem of regio (see region). Related: Regionally.

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Online Etymology Dictionary, © 2010 Douglas Harper

interregional in Medicine

regional

(rējə-nəl)
adj.
  1. Of or affecting a region of the body.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.