Neo-Sumerian adjective 1noun 1forms 1 adjective1 •(historical) Of or relating to the Third Dynasty of Ur, or Neo-Sumerian Empire, a 22nd- to 21st-century-BCE Sumerian ruling dynasty based in the city of Ur and a short-lived territorial-political state sometimes regarded as a nascent empire. noun1 •(historical) An inhabitant of the Neo-Sumerian Empire. formsNeo-Sumerians