also: ていげん
noun
Jōgen era; Teigen era
Japanese era name (nengō) spanning 976–978 CE. The reading じょうげん (Jōgen) is standard; ていげん (Teigen) is an alternate reading.
貞元年間は、平安時代中期の短い元号の一つである。
The Jōgen era is one of the short era names of the mid-Heian period.
この文書は貞元二年の日付がある。
This document is dated the second year of the Jōgen era.
The era name 貞元 (Jōgen) was adopted in 976 CE. The exact derivation is uncertain; it follows the typical pattern of selecting auspicious kanji for era names.