知事

Noun

 * 1)  magistrate or governor of a county or medium-size town during early days of the Republic of China
 * 2) governor or magistrate of a Japanese prefecture or South Korean province

Adjective

 * 1)  sensible; reasonable; wise

Etymology
From obsolete, which was often referred to as 知某州事 (one who knows matters concerning the county/province), which shortens to 知事.

Noun

 * 1) prefectural governor