#1
watershed n. [
water parting, divide] a ridge of land that separates two adjacent river systems
. wn #2
watershed n. [
river basin, basin, drainage basin, catchment area, catchment basin, drainage area] 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"
. wn #3
watershed n. [
landmark, turning point] 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"
. wn