watershed

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watershed
  • noun
    An area or ridge of land that separates waters flowing to different rivers, basins, or seas. (In the Marin watershed on Pumpkin Ridge, Davidson showed me a site where Rizzo and other scientists had injected some healthy coast live oaks with P. ramorum.)
    An event or period marking a turning point in a course of action or state of affairs. (these works mark a watershed in the history of music)

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