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

  • n. The lowest region of the atmosphere between the earth's surface and the tropopause, characterized by decreasing temperature with increasing altitude.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The lower levels of the atmosphere extending from the earth's surface up to the tropopause. It is characterized by convective air movements and a large vertical temperature change.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude)


From French troposphère. (Wiktionary)



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