Of or pertaining to the region of lower Babylonia, which was anciently called Sumer, or its inhabitants or their language.

A native of lower Babylonia, anciently called Sumer.

Sumerian is an ancient language that was spoken in the deep South of present-day Iraq in third millennium BC. Spoken Sumerian died out at the end of that millennium but the language was still used for religious, literary, and scholarly purposes up to the first century AD. Sumerian is not related to any known language.

a member of a people who inhabited ancient Sumer

of or relating to ancient Sumer or its inhabitants

The language of the sumerian people of lower Tigris-Euphrates valley. It became the standard language of Babylonia.