(每日一词）annuity

Annuity  /əˈnjuː.ə.t̬i/ n. （通常指一直付到某人死亡的）年金；年金保险；年金保险投资

meaning: a fixed amount of money paid to someone very year, usually until their death, or the insurance agreement or investment that provides the money that is paid. 

词根：ann- 年

后缀：-ity名词后缀

补充：annual adj. 每年的；anniversary n. 周年纪念