KansasPronunciation: /ˈkanzəs/Definition of Kansas a state in the central US; population 2,802,134 (est. 2008); capital, Topeka. Acquired as part of the Louisiana Purchase in 1803, it became the 34th state of the US in 1861. Derivatives Kansan adjective & noun Kansas in other Oxford dictionaries Definition of Kansas in the US English dictionary