This was the name of two kingdoms in the history of Korea. The first was conquered by the Han Empire in the 2nd century BC. The second ruled Korea from the 14th century until the 19th century. The name of these kingdoms was written using the Sino-Korean characters 朝 (jo) meaning "dynasty" and 鮮 (seon) meaning "new", though the actual origin is assumed to be Korean. This name is now used in North Korea to refer to the country of North Korea.
Means "middle kingdom", from Chinese 中 (zhōng) meaning "middle" and 国 (guó) meaning "country, state". This is the Chinese name for China. The name originally referred to China's central regions, as opposed to the territory on the fringes.