Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

sub- +‎ region

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