Dictionary.net

the intersection of two streets; "standing on the corner watching all the girls go by"

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"

the intersection of two streets; "standing on the corner watching all the girls go by"

The point of a decisive change in direction or action; a crisis.

The point on which a matter turns or which decides a case.

That which decides a matter.