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

  • n. The land area drained by a river and its tributaries.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An extent of land where water from rain or snow melt drains downhill into a river or series of rivers.

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

  • n. 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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