Watershed (noun)
definition:
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"
Synonyms
Turning PointWatershed (noun)
definition:
the entire geographical area drained by a river and its tributaries
Synonyms
BasinWatershed (noun)
definition:
a ridge of land that separates two adjacent river systems
