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Generally, the term refers to those who spoke one of the "Semitic" languages.
The term itself wasn't used until 1770, and it comes from "Shem"—one of the three sons of Noah.
The groups include East Semitic groups (Akkadians, Assyrians, Babylonians); Central Semitic groups (Arabs and Canaanites such as Phoenicians and Hebrews, as well as Aramaeans); and South Semitic groups (South Arabs and Ethiopians). T
One of the largest Semitic groups were Aramaeans—who would never have a unified empire, but whose language became dominant in the region from about 800 BC until about 700 BC, when it replaced by Arabic.
The Semitic-speaking Akkadians conquered Sumer around 2270 BC
What are "Semitic groups"?