a place, locale, or area that constitutes a natural ecological community.

1980–85; bio- + region

bioregional, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
bioregion   (bī'ō-rē'jən)  Pronunciation Key 
An area constituting a natural ecological community with characteristic flora, fauna, and environmental conditions and bounded by natural rather than artificial borders.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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