noun
the whole realm; the entire world under heaven
A yojijukugo (four-character compound) of classical Chinese origin, used in literary or historical contexts to refer to the entire domain ruled by an emperor or the whole world. Not used in everyday modern Japanese.
一天万乗の君として、彼は広大な領土を治めた。
As the sovereign of the whole realm, he ruled over a vast territory.
A yojijukugo of classical Chinese origin. 一天 (itten) means 'one heaven' or 'the whole sky', and 万乗 (banjō) literally 'ten thousand chariots', a classical metaphor for the emperor's domain. The compound refers to the entire realm under a single ruler.