Definition from Wiktionary, the free dictionary
Alternative forms 
- IPA: /ˈkɔˈsæk/
- Hyphenation: Cos‧sack
- A member or descendant of an originally (semi-)nomadic population of Eastern Europe and the adjacent parts of Asia, that eventually settled in parts of the Polish-Lithuanian Commonwealth, the Russian tsarist Empire (where they constituted a legendary military caste) and the Soviet Union, particularly in areas now comprising southern Russia and Ukraine.
- A member of a military unit (typically cavalry, originally recruited exclusively from the above)
Related terms 
member of a population
member of a Cossack military unit
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