[Gre.go.ri.an] adj (1642): of or relating to Pope Gregory XIII or the Gregorian calendar
[2]Gregorian adj (1653) 1: of or relating to Pope Gregory I
2: of, relating to, or having the characteristics of Gregorian chant [3]Gregorian adj [St. Gregory the Illuminator d. 332, apostle of Armenia] (1955): of or relating to the Armenian national church