#September__Sep__Sept  the month following August and preceding October
  supertype:  #Gregorian_calendar_month  a month in the Gregorian calendar
  part:  #Michaelmas_Day  #Labor_Day  #Citizenship_Day  #American_Indian_Day  #mid-September
  part of:  #Gregorian_calendar__New_Style  the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
  part of:  #autumn__fall  the season when the leaves fall from the trees; "in the fall of 1973"

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