from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun 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.
- noun The portion of the
atmospherefrom sea-level to about 4000 meters in which it is possible to breathewithout technological assistance.
- noun the
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