gregorian
1. Gre.go.ri.an \gri-'go-r-e--*n, -'go.r-\ aj : of or relating to Pope Gregory XIII or the Gregorian calendar 2. Gregorian aj 1: of or relating to Pope Gregory I 2: of, relating to, or having the characteristics of Gregorian chant 3. Gregorian aj [St Gregory the Illuminator -332] : of or relating to the Armenian national church