Definition of watershed noun from the Oxford Advanced American Dictionary

     

    watershed

     noun
    noun
    NAmE//ˈwɔt̮ərˌʃɛd//
     
    , NAmE//ˈwɑt̮ərˌʃɛd//
     
    [countable]
     
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  1. 1watershed (in something) an event or a period of time that marks an important change The middle decades of the 19th century marked a watershed in Russia's history.
  2. 2a line of high land where streams on one side flow into one river, and streams on the other side flow into a different river
See the Oxford Advanced Learner's Dictionary entry: watershed