[noun] a king, especially one who is not East Asian or was East Asian in pre-imperialtimes; in China and Vietnam, generally a king before Qin Shi Huangdi who invented the title 皇帝(kōtei, “huangdi; emperor”); in Korea, one of the many kings before the Korean Empire which was modeled after Japan's; in Japan, one of the rulers before Emperor Jinmu
[noun] a nobilitytitle for a Chinese or Vietnamese prince, bestowed on one of the 皇帝(kōtei, “huangdi; emperor”)'s adult sons, brothers, or nephews, especially as a coming-of-age title, generally comes with an estate ("principality"); compare 皇子(ōji, “imperial princes”, especially pre-adult ones) and 公(kō, “dukes”, an alternative used by certain dynasties)
[noun] a Japaneseprince's son(such princes include 親王(shinnō) or 王(ō) themselves)