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Gregorian 

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gregorian
adjective
1.	of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church
2.	of or relating to Pope Gregory XIII or the calendar he introduced in 1582

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Gregorian

Cal"en*dar\, n. [OE. kalender, calender, fr. L. kalendarium an interest or account book (cf. F. calendrier, OF. calendier) fr. L. calendue, kalendae, calends. See Calends.]

1. An orderly arrangement of the division of time, adapted to the purposes of civil life, as years, months, weeks, and days; also, a register of the year with its divisions; an almanac.

2. (Eccl.) A tabular statement of the dates of feasts, offices, saints' days, etc., esp. of those which are liable to change yearly according to the varying date of Easter.

3. An orderly list or enumeration of persons, things, or events; a schedule; as, a calendar of state papers; a calendar of bills presented in a legislative assembly; a calendar of causes arranged for trial in court; a calendar of a college or an academy.

Note: Shepherds of people had need know the calendars of tempests of state. --Bacon.

Calendar clock, one that shows the days of the week and month.

Calendar month. See under Month.

French Republican calendar. See under Vend['e]miaire.

Gregorian calendar, Julian calendar, Perpetual calendar. See under Gregorian, Julian, and Perpetual.