Chinese words ending with 级数 (jíshù) 级数 dictionary entry 6 words. 幂(mì)级(jí)数(shù) power series 几(jǐ)何(hé)级(jí)数(shù) geometric series 等(děng)差(chā)级(jí)数(shù) arithmetic series 算(suàn)术(shù)级(jí)数(shù) arithmetic series 等(děng)比(bǐ)级(jí)数(shù) geometric series 收(shōu)敛(liǎn)级(jí)数(shù) convergent series