Julian calendar Meaning, Definition & Usage

  1. noun 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.

WordNet


Definitions
  1. the calendar as adjusted by Julius Cæsar, in which the year was made to consist of 365 days, each fourth year having 366 days.

Webster 1913