Wa"ter*shed`(?), n. [Cf. G. wasserscheide; wasser water + scheide a place where two things separate, fr. scheiden to separate.]
1. The whole region or extent of country which contributes to the supply of a river or lake.
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
[1913 Webster +PJC]
3. a point in time marking an important transition between two situations, or phases of an activity; a turning point.
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Tue 11th December 2018