Alexander2Pronunciation: /ˌalɪgˈzɑːndə/Definition of Alexander the name of three kings of Scotland: Alexander I (circa 1077–1124), son of Malcolm III, reigned 1107–24. Alexander II (1198–1249), son of William I of Scotland, reigned 1214–49. Alexander III (1241–86), son of Alexander II, reigned 1249–86. Alexander in other Oxford dictionaries Definition of Alexander in the US English dictionary