#era  a period marked by distinctive character or reckoned from a fixed point or event
  supertype:  time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  subtype:  age.era  a historic period; "we live in a litigious age"
     instance:  Elizabethan_age  Victorian_age
  subtype:  Christian_Era__Common_Era  the time period beginning with the year of Christ's birth
  subtype:  day.era  an era of existence or influence; "in the day of the dinosaurs"; "in the days of the Roman Empire"; "in the days of sailing ships"; "he was a successful pianist in his day"
  subtype:  historic_period  an era of history having some distinctive feature
     subtype:  antiquity.historic_period  the historic period preceding the Middle Ages in Europe
     subtype:  middle_ages__dark_ages  the period of history between classical antiquity and the Italian Renaissance
     subtype:  industrial_revolution__technological_revolution__technologicalrevolution  the transformation from an agricultural to an industrial nation
     subtype:  reign.historic_period  the period during which a monarch is sovereign; "during the reign of Henry VIII"
     subtype:  turn_of_the_century  the period from about 1890 to 1910
     subtype:  New_Deal.historic_period__newdeal  the historic period (1933-1940) in the U.S. during which President Franklin Roosevelt's economic policies were implemented
     subtype:  Reconstruction  the period after the United States Civil War when the southern states were reorganized and reintegrated into the Union; 1865-1877
     subtype:  Restoration.historic_period__restoration  the reign of Charles II in England; 1660-1685
     instance:  Renaissance  Reign_of_Terror
  subtype:  modern_era  the present or recent times

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