纪元

calendar era / epoch

surname Yuan / the Yuan or Mongol dynasty (1279-1368)

currency unit (esp. Chinese yuan) / first / original / primary / fundamental / constituent / part / era (of a reign) / meta- (prefix) / (math.) argument / variable / (Tw) (geology) eon

surname Ji / also pr. [Ji4]

order / discipline / age / era / period / to chronicle