watershed - definition and synonyms

noun 

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/ˈwɔːtə(r)ˌʃed/
singularwatershed
pluralwatersheds
  1. 1
    [singular] an event that causes an important change to take place
    watershed in:

    The crisis was a watershed in the history of our country.

    1. a.
      [singular] British a time in the evening when television stations start to broadcast programmes that are only suitable for adults

      the 9 o’clock watershed