A member or descendant of an originally (semi-)nomadic population of Eastern Europe and the adjacent parts of Asia, formed in part of runaways from neighbouring countries, that eventually settled in parts of the Polish-Lithuanian Commonwealth and the Russian tsarist Empire (where they constituted a legendary military caste), particularly in areas now comprising southern Russia and Ukraine.
A member of a militaryunit (typically cavalry, originally recruited exclusively from the above).
Circa 1600, from Middle French cosaque, from Polish Kozak, from Ukrainian коза́к (cf. Russian каза́к or коза́к (older spelling)), from Kazakh казак, from a Turkic word quzzāq meaning “free man, wanderer," from Old Turkic *qazǧaq, from qazǧanmaq, from qazmaq, from Proto-Turkic *kaŕ-. Cognate with Kazakh.
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