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watershed

 
/ˈwɔ·t̬ərˌʃed/, /ˈwɑt̬·ər-/ n [U] (BIG CHANGE)

Definition

an event or period that is important because it represents a big change and the start of new developments: a watershed event/moment The discovery of penicillin was a watershed in the history of medicine.
(Definition of watershed n (BIG CHANGE) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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