also: そうねいでん
noun
ladies' pavilion (Heian Palace)
A specific building within the inner Heian Palace, one of the 七殿 (Seven Halls) or 十七殿 (Seventeen Halls). Used as a residence for imperial consorts and ladies-in-waiting.
常寧殿は平安宮内裏の七殿の一つで、后妃の住まいとして使われた。
Jōneiden was one of the Seven Halls of the inner Heian Palace and was used as a residence for imperial consorts.
The name 常寧殿 (Jōneiden) is composed of 常 (ever, constant), 寧 (peaceful), and 殿 (hall, palace). It is a historical building name from the Heian period; the exact origin of the name is uncertain.