St. Stephen's Day /sənt ˈstiːvənz deɪ/ noun1 •A Christian holiday commemorating Saint Stephen the protomartyr (first Christian martyr; died 34 C.E.), falling immediately after Christmas Day (on December 26 in the Western Church and on December 27 in the Eastern Orthodox Church).Late in the morning of St. Stephen's Day, Marc mounted his horse, ready to leave Windsor, Cecily, and all of Angleterre. — 2015 formsSt. Stephen's Days