Setsubun,' or 'sechibun,' means the day before the beginning of a season, while the first day of spring, summer, autumn or winter is called 'risshun,' 'rikka,' 'risshu' or 'ritto,' respectively.
節分（せつぶん、またはせちぶん）は、各季節の始まりの日（立春・立夏・立秋・立冬）の前日のこと。