Cossack Definition
 kŏsăk 
    noun
  
 A member of any of several groups of peasants, chiefly of Russian and Polish descent, that lived in autonomous communal settlements, esp. in the Ukraine, until the late 19th cent: in return for special privileges, they served in the cavalry under the czars.
 Webster's New World 
Alternative capitalization of Cossack.
 Wiktionary 
    adjective
  
 Of or characteristic of the Cossacks or their culture.
 Webster's New World 
Other Word Forms of Cossack
Noun
Singular:
 CossackPlural:
 cossacksOrigin of Cossack
-  
Russian kazak Ukrainian kozak both from South Turkic qazaq adventurer Kazakh
From American Heritage Dictionary of the English Language, 5th Edition
 
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