N-COUNT
(定期付款的)书面承诺;(尤指向慈善机构定期捐款的)契约
A covenant is a formal written promise to pay a sum of money each year for a fixed period, especially to a charity.
例句
If you make regular gifts through a covenant we can reclaim the income tax which you have already paid on this money.
如果你签订契约定期捐赠,那么我们可以要求返还你这笔钱上交的所得税。