Definition of: Sumerian

(s·mir′ē·ən) adjective
Of or pertaining to ancient Sumer, its people, or their language.
—noun
1. One of an ancient non–Semitic people formerly occupying a part of lower Babylonia: culturally important in the Near East from about 3300–1800 B.C.
2. The agglutinative, unclassified language of these people, written in cuneiform characters and preserved on rocks and clay tablets the earliest of which date from about 4000 B.C. Also Su·mir′i·an.