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geographical name\ˌme-s(ə-)pə-ˈtā-mē-ə, -myə\
Definition of MESOPOTAMIA
region SW Asia between the Tigris & the Euphrates extending from the mountains of E Asia Minor to the Persian Gulf
the entire Tigris-Euphrates valley
— Mes·o·po·ta·mian\-mē-ən, -myən\adjective or noun
Region between the Tigris and Euphrates rivers in the Middle East, constituting the greater part of modern Iraq. The region's location and fertility gave rise to settlements some 10,000 years ago, and it became the cradle of some of the world's earliest civilizations and the birthplace of writing. It was first settled by the Sumerians, who were succeeded by the Akkadians and later by the Babylonians. Successive peoples came to dominate the region until the rise of the Persian Achaemenian dynasty in the 6th century BC. The Achaemenids were overthrown by Alexander the Great in the early 4th century BC, and Mesopotamia was ruled by the Seleucid dynasty from c. 312 BC until the mid-2nd century BC, when it became part of the Parthian empire. In the 7th century AD the region was conquered by Muslim Arabs. The region's importance declined after the Mongol invasion in 1258. Rule by the Ottoman Empire over most of the region began in the 16th century. The area became a British mandate in 1920; the following year Iraq was established there.