Gregorian

[gri-gawr-ee-uh n, -gohr-] /grɪˈgɔr i ən, -ˈgoʊr-/

adjective
1.
of or relating to any of the popes named , especially or .
/ɡrɪˈɡɔːrɪən/
adjective
1.
relating to, associated with, or introduced by any of the popes named Gregory, esp Gregory I or Gregory XIII
adj.

literally “pertaining to Gregory,” from Late Latin Gregorianus, from Gregorius (see Gregory). From c.1600 in reference to church music, from Gregory I (pope from 590-600), who traditionally codified it; 1640s in reference to new calendar (introduced 1582) from Pope Gregory XIII.

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Gregorian-calendar
noun 1. the reformed Julian calendar now in use, according to which the ordinary year consists of 365 days, and a leap year of 366 days occurs in every year whose number is exactly divisible by 4 except centenary years whose numbers are not exactly divisible by 400, as 1700, 1800, and 1900. noun 1. […]
Gregorian-chant
noun 1. the plain song or cantus firmus used in the ritual of the Roman Catholic Church. 2. a melody in this style. noun 1. another name for plainsong The traditional music for Latin texts in the worship of the Roman Catholic Church. Gregorian chant is marked by performance in unison and by free-flowing rhythms […]
Gregorian-mode
noun, Music. 1. .

Gregorian-telescope
noun 1. a telescope similar in design to the Cassegrainian telescope but less widely used. noun 1. a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror
Gregorian tone
noun 1. a plainsong melody See tone (sense 6)