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Definition of Drainage basin

Drainage basin Definition from Business & Finance Dictionaries & Glossaries
BTS Transportation Expressions
The land drained by a river system. (DOE5)
By the Bureau of Transportation Statistics.
Drainage basin Definition from Science & Technology Dictionaries & Glossaries
EIA Energy Glossary
The land drained by a river system.
Source: Energy Information Administration, 2006
Glossary of water terms
land area where precipitation runs off into streams, rivers, lakes, and reservoirs. It is a land feature that can be identified by tracing a line along the highest elevations between two areas on a map, often a ridge. Large drainage basins, like the area that drains into the Mississippi River contain thousands of smaller drainage basins. Also called a "watershed."
Drainage basin Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A drainage basin or watershed (North American English usages) is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point at a lower elevation, usually the of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean. For example, a tributary stream of a brook which joins a small river, which is tributary of a larger river is thus part of a series of successively smaller area but higher elevation drainage basins (watersheds). Similarly, the Missouri and American rivers are each part of their own drainage basins/watersheds and that of the Mississippi River.

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Drainage basin Definition from Society & Culture Dictionaries & Glossaries
EPA Terms of Environment
The area of land that drains water, sediment, and dissolved materials to a common outlet at some point along a stream channel.
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering (English ver.)
A subdivision of a watershed.
Drainage basin Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. the geographical area draining into a river or reservoir
(synonym) catchment area, catchment basin, drainage area
(hypernym) geographical area, geographic area, geographical region, geographic region