一いっ世せい一いち元げん

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Meanings

noun

one era name per emperor

yojijukugo (four-character idiom)

Historical term referring to the system, adopted in Japan during the Meiji period, in which each emperor's reign is assigned a single era name (gengō).

明めい治じ以い降こう、一いっ世せい一いち元げんの制せいが定さだめられた。
After the Meiji period, the system of one era name per emperor was established.