GREGORIAN
Gregorian
(adjective) of or relating to Pope Gregory XIII or the calendar he introduced in 1582
Gregorian
(adjective) of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church
Source: WordNet® 3.1
Gre*go"ri*an, a. Etym: [NL. Gregorianus, fr. Gregorius Gregory, Gr.
grégorien.]
Definition: Pertaining to, or originated by, some person named Gregory,
especially one of the popes of that name. Gregorian calendar, the
calendar as reformed by Pope Gregory XIII. in 1582, including the
method of adjusting the leap years so as to harmonize the civil year
with the solar, and also the regulation of the time of Easter and the
movable feasts by means of epochs. See Gregorian year (below).
– Gregorian chant (Mus.), plain song, or canto fermo, a kind of
unisonous music, according to the eight celebrated church modes, as
arranged and prescribed by Pope Gregory I. (called "the Great") in
the 6th century.
– Gregorian modes, the musical scales ordained by Pope Gregory the
Great, and named after the ancient Greek scales, as Dorian, Lydian,
etc.
– Gregorian telescope (Opt.), a form of reflecting telescope, named
from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A
small concave mirror in the axis of this telescope, having its focus
coincident with that of the large reflector, transmits the light
received from the latter back through a hole in its center to the
eyepiece placed behind it.
– Gregorian year, the year as now reckoned according to the
Gregorian calendar. Thus, every year, of the current reckoning, which
is divisible by 4, except those divisible by 100 aud not by 400, has
366 days; all other years have 365 days. See Bissextile, and Note
under Style, n., 7.
Source: Webster’s Unabridged Dictionary 1913 Edition