[, ]a price for sth that is fixed at a particular amount and does not change; an amount paid or charged that is the same for everyone统一价格◆Repayments on the loan are made at a flat rate of interest.贷款是按统一利率偿还的。◆Employees contribute a flat rate of 5% of income to the fund.员工一律将其 5% 的收入捐赠给这个基金。◆a flat-rate tax system (= in which everyone pays the same percentage of tax)统一税制