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English definition of “watershed”

watershed

noun [U] (BIG CHANGE)   /ˈwɔ·t̬ərˌʃed, ˈwɑt̬·ər-/
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 noun (BIG CHANGE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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