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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Watershed \Wa"ter*shed'\, noun [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 {divide} and {water parting}. [1913 Webster +PJC]
3. a point in time marking an important transition between two situations, or phases of an activity; a turning point. [PJC]
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Divide \Di*vide"\, noun A dividing ridge of land between the tributaries of two streams; also called {watershed} and {water parting}. A divide on either side of which the waters drain into two different oceans is called a {continental divide}. [1913 Webster +PJC]
From WordNet (r) 2.0 [wn]:
watershed
noun
1: a ridge of land that separates two adjacent river systems [syn: {water parting}, {divide}]
2: an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations" [syn: {landmark}, {turning point}]
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