Definitions

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

  • n. The regions of the universe, especially on the earth, that are capable of supporting life; the biosphere.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance.
  • n. the biosphere

Etymologies

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