Watershed - Definition
watershed
n 1: a ridge of land that separates two adjacent river systems
[syn: watershed, water parting, divide]
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" [syn: river basin, basin, watershed, drainage
basin, catchment area, catchment basin, drainage area]
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"
[syn: landmark, turning point, watershed]