Cossack

[ kos-ak, -uh k ]
/ ˈkɒs æk, -ək /
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noun

(especially in czarist Russia) a person belonging to any of certain groups of Slavs living chiefly in the southern part of Russia in Europe and forming an elite corps of horsemen.

Origin of Cossack

1590–1600; < Polish kozak or Ukrainian kozák, ultimately < a Turkic word taken to mean “adventurer, freebooter,” adopted as an ethnic name by Turkic tribal groups of the Eurasian steppes
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British Dictionary definitions for cossack

Cossack

/ (ˈkɒsæk) /

noun

(formerly) any of the free warrior-peasants of chiefly East Slavonic descent who lived in communes, esp in Ukraine, and served as cavalry under the tsars

adjective

of, relating to, or characteristic of the Cossacksa Cossack dance

Word Origin for Cossack

C16: from Russian kazak vagabond, of Turkic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012