watershed - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “watershed”

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watershed

noun  us   /ˈwɔ·t̬ərˌʃed, ˈwɑt̬·ər-/

watershed noun (BIG CHANGE)

[U] 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.

watershed noun (AREA)

earth science [C] a high area of land where rain collects, some of it flowing down to supply rivers, lakes, etc., at lower levels
(Definition of watershed from the Cambridge Academic Content Dictionary © Cambridge University Press)
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