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Cossack, (from Turkic kazak, “adventurer” or “free man”), member of a people dwelling in the northern hinterlands of the Black and Caspian seas. They had a tradition of independence and finally received privileges from the Russian government in return for military services. Originally (in the 15th century) the term referred to semi-independent Tatar groups, which formed in the Dnieper region. The term was also applied (by the end of the 15th century) to peasants who...