#historic_period  an era of history having some distinctive feature
  supertype:  era  a period marked by distinctive character or reckoned from a fixed point or event
  subtype:  antiquity.historic_period  middle_ages  industrial_revolution  reign.historic_period  turn_of_the_century  New_Deal.historic_period  Reconstruction  Restoration.historic_period
  instance:  Renaissance  Reign_of_Terror
  part of:  history  the aggregate of past events: "a critical time in the school's history"

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