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Noun: Julian calendar  'jool-yun 'ka-lun-du(r)
  1. The solar calendar introduced in Rome in 46 b.c. by Julius Caesar and slightly modified by Augustus, establishing the 12-month year of 365 days with each 4th year having 366 days and the months having 31 or 30 days except for February
    - Old Style calendar

Type of: solar calendar

Encyclopedia: Julian calendar