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

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

importance

(politics, historical) an acting lesser counselor in the 太政官 (Daijō-kan)

(government, historical) one of the 三局 (Sankyoku, “three offices”) in the 太政官 (Daijō-kan), so named because clerical work there were done by the shōnagon and subordinate secretaries

South Pyongan (a province of North Korea)

North Pyongan (a province of North Korea)

anachronism

youth (part of life following childhood)

period drama