Definition of Julian calendar noun from the Oxford Advanced Learner's Dictionary

 

Julian calendar

 noun
noun
BrE BrE//ˌdʒuːliən ˈkælɪndə(r)//
 
; NAmE NAmE//ˌdʒuːliən ˈkælɪndər//
 
[singular]
 
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the system of arranging days and months in the year introduced by Julius Caesar, and used in Western countries until the Gregorian calendar replaced it
See the Oxford Advanced American Dictionary entry: Julian calendar