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

  • n. A large body of air with only small horizontal variations of temperature, pressure, and moisture.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a widespread body of air, the properties of which can be identified as:

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

  • n. a large body of air with uniform characteristics horizontally


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