noun, noun or participle which takes 'suru', intransitive verb
bridal entry into the imperial court
Historical term referring to the formal ceremony in which an empress or imperial consort entered the imperial palace for the first time. Used in contexts related to the Heian period and earlier Japanese court customs.
平安時代には、后が入内する儀式が盛大に行われた。
In the Heian period, the ceremony for the empress's bridal entry into the court was held with great pomp.
Compound of 入 (nyū, 'enter') and 内 (dai, 'inside; imperial court'). The reading じゅだい is a historical Sino-Japanese reading. The exact derivation of the reading is uncertain, but it is conventionally associated with the meaning of entering the imperial palace.