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English definition of “watershed”

watershed

noun [S] (BIG CHANGE)    /ˈwɔː.tə.ʃed/ US  /ˈwɑː.t̬ɚ-/
an event or period that is important because it represents a big change in how people do or think about something: The year 1969 was a watershed in her life - she changed her career and changed her partner .Turning points and deciding moments
(Definition of watershed noun (BIG CHANGE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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