watershed

Meanings

1. 1
   noun

   an event marking a unique or important historical change of course or one on which important developments depend

   The agreement was a watershed in the history of both nations.

2. 2
   noun

   A critical point marking a change in course or development.

   In the minds of many, 1847 was a watershed year during which Ceres, Pallas, Juno, Vesta, and Astraea were reclassified as asteroids.

From water + shed. A calque of German Wasserscheide.

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