from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A subdivision of a region, especially an ecological region.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A region that is part of a larger region.

from The Century Dictionary and Cyclopedia

  • n. A subdivision of a region; in zoögeog., a faunal area subordinate in extent to one called a region.
  • n. See the adjectives.


sub- +‎ region (Wiktionary)



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