watershed
US /ˈwɑː.t̬ɚ.ʃed/
UK /ˈwɑː.t̬ɚ.ʃed/
1.
bassin versant
an area or ridge of land that separates waters flowing to different rivers, basins, or seas.
2.
bassin versant
an event or period marking a turning point in a situation.
:
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these works were a watershed in the history of music