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Definition of Gregorian calendar noun from the Oxford Advanced American Dictionary


Gregorian calendar

NAmE//ɡrɪˌɡɔriən ˈkæləndər//
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the system used since 1582 in Western countries of arranging the months in the year and the days in the months and of counting the years from the birth of Christ compare Julian calendar
See the Oxford Advanced Learner's Dictionary entry: Gregorian calendar