Cossack
1598, from Rus. kozak, from Turk. quzzak "adventurer, guerilla, nomad," from qaz "to wander." The same Turkic root is the source of the people-name Kazakh and the nation of Kazakhstan.
The name (Cossack) entered the English language via French
Cosaque, which was a translation from the Polish, which was derived from the Ukrainian
Kozak (In Russian
Kazak). It is originally a Turkic word,
qazaq, which means "adventurer" or "free man".
http://wiki.answers.com/Q/What_does_the_word_Cossack_mean
кОзак - притаманно не тільки українській мові, але й в англійській, французькій, польській версіях.
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І ще , про арійців і козаків:
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