age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

Heian period of Japan (794-1185 AD)

position (in society); (social) standing; (social) status

important, significant

importance, consequence, significance

peaceful

peace

abbreviation of 平(へい)安(あん)時(じ)代(だい) (Heian jidai, “the Heian period of Japanese history”)

(archaic, rare) a bone, particularly a covering bone such as a skull or kneecap

Alternative spelling of 河原