from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An area drained by a river system.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun hydrology A
topographicregion in which all water drains to a common outlet; a watershed.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
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