Etymology
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Gregorian (adj.)

"pertaining to Gregory," from Late Latin Gregorianus, from Gregorius (see Gregory). From c. 1600 of church music, in reference to Gregory I the Great (pope from 590-604), who traditionally codified it; 1640s in reference to new calendar (introduced 1582) from Pope Gregory XIII (1572-1585); due to Protestant resistance, the calendar was not introduced in England and the American colonies until 1752.

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Definitions of Gregorian

Gregorian (adj.)
of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church;
Gregorian (adj.)
of or relating to Pope Gregory XIII or the calendar he introduced in 1582;
From wordnet.princeton.edu