January 1 n 1: (Roman Catholic Church and Anglican Church) feast day celebrating the circumcision of Jesus; celebrated on January 1st [syn: {Circumcision}, {Feast of the Circumcision}] 2: (Roman Catholic Church) a holy day of obligation [syn: {Solemnity of Mary}] 3: the first day of the year [syn: {New Year's Day}, {New Year's}]