一いち代だい一いち度ど

noun which may take the genitive case particle 'no', noun

once in an emperor's reign

A set phrase referring to an event or ceremony that occurs only once during the reign of a particular emperor. Often used in historical or formal contexts.

• 大だい嘗じょう祭さいは一いち代だい一いち度どの重じゅう要ような儀ぎ式しきです。

  The Daijosai is an important ceremony that takes place only once in an emperor's reign.