Meaning

noun a member of a Slavic people living in southern European Russia and Ukraine and adjacent parts of Asia and noted for their horsemanship and military skill; they formed an elite cavalry corps in czarist

originFrom Middle French cosaque, from Middle Polish Kozak, from Middle Ukrainian коза́къ (kozák), from Kipchak *qazaq (whence Armeno-Kipchak խազախ (xazax)), from Old Turkic 𐰴𐰔𐰍𐰸 (*qazǧaq, “profiteer”), from 𐰴𐰔𐰍𐰣𐰢𐰴 (qazǧanmaq, “to acquire”), from 𐰴𐰔𐰢𐰴 (qazmaq, “to dig out”), from Proto-Turkic *kaŕ-. Doublet of Kazakh. First appears c. 1587 in the writings of George Turberville.

Etymology from Wiktionary, CC BY-SA 3.0