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English to English noun
| 1 |
a ridge of land that separates two adjacent river systems |  | source: wordnet30
| 2 |
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet | | Example: flood control in the Missouri basin
source: wordnet30
| 3 |
an event marking a unique or important historical change of course or one on which important developments depend | | Example: the agreement was a watershed in the history of both nations
source: wordnet30
| 4 |
The whole region or extent of country which contributes to the supply of a river or lake. | | source: webster1913
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