Gregorian calendar

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Gregorian calendar /grɪˈgorijən-/ noun
Gregorian calendar
/grɪˈgorijən-/
noun
Learner's definition of GREGORIAN CALENDAR
[singular]
: the calendar system that is used by most people in the world today
◊ The Gregorian calendar was introduced in 1582 by Pope Gregory XIII. It is now used throughout the world for legal and business purposes.