Emily Dickinson Lexicon

GRE-GO'RI-AN, a.

Denoting what belongs to Gregory. The Gregorian calendar is one which shows the new and full moon, with the time of Easter, and the movable feasts depending thereon, by means of epacts. The Gregorian year, is the present year, as reformed by Pope Gregory XIII, in 1582; consisting of 365 days, 5 hours, 48 minutes, 47 seconds, with an additional day every fourth year. Encyc. A Gregorian chant is choral music according to the eight celebrated church modes, as arranged by Pope Gregory. Porter.