応おう徳とくおうとくMeanings1nounŌtoku era (1084.2.7–1087.4.7)A historical Japanese era name (年号) from the late Heian period. Used only in historical contexts.応おう徳とく年ねん間かんに白しら河かわ天皇てんのうが即そく位いした。Emperor Shirakawa ascended the throne during the Ōtoku era.