01 n. The whole region or extent of country which contributes to the supply of a river or lake.
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1.
The whole region or extent of country which contributes to the supply of a river or lake.
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2.
The line of division between two adjacent rivers or lakes with respect to the flow of water by natural channels into them; the natural boundary of a basin; -- called also divide and water parting. Also: divide, water parting
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3.
a point in time marking an important transition between two situations, or phases of an activity; a turning point.