Regiment (administrative unit)

Regiment or Regimental system (, "polk"; , "polkovyi ustriy") is a historical administrative, territorial, military and judicial unit of country's subdivision in Cossack Hetmanate and Sloboda Ukraine in 17th and 18th centuries.
The system was expanded out of already existing system of Registered Cossacks over Kiev, Bratslav, and Chernihiv voivodeships.
Regiments were headed by colonel (, "polkovnyk") who was a member of the Council of Officers ("Rada Starshyn").