adjective
1. of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church
• Pertains to noun: ↑Gregory I, ↑Gregorian chant
• Derivationally related forms: ↑Gregory
2. of or relating to Pope Gregory XIII or the calendar he introduced in 1582
• Pertains to noun: ↑Gregory XIII, ↑Gregorian calendar
• Derivationally related forms: ↑Gregory
Useful english dictionary. 2012.