Cossack

Noun

 * 1) 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.
 * 2) A cossack, member of a military unit (typically cavalry, originally recruited exclusively from the above)

Related terms

 * Kazakh
 * Kazakhstan