from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A front along which an advancing mass of warm air rises over a mass of cold air.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A warm front is the trailing edge of a retreating mass of cold air.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the front of an advancing mass of warmer air
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