noun : WATERSHEDS
Source: WordNet 3.1
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1. (
) a ridge of land that separates two adjacent river systems ;
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2. (
) the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; "flood control in the Missouri basin" ;
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3. (
) 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" ;
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