World English Dictionary
ecoregion (ˈiːkəʊˌriːdʒən)
an area defined by its environmental conditions, esp climate, landforms, and soil characteristics

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Main Entry:  ecoregion
Part of Speech:  n
Definition:  an area defined by environmental conditions and natural features; a region defined by its ecology
Example:  Ecoregions contain many landscapes with different spatial patterns of ecosystems.
Etymology:  1962; blend of ecology + region
Usage:  ecoregional, adj's 21st Century Lexicon
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