不定元

indeterminate element (math.), often denoted by x

no; not so / (bound form) not; un-

indefinite / indeterminate / (botany) adventitious

to set / to fix / to determine / to decide / to order

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