[, ] () money that sb receives from an investment or a pension that does not change or increase固定收入（来自定息投资或养老金的收入）◆retired people living on fixed incomes靠固定收入生活的退休人员◆fixed-income investments/securities固定收益投资／证券investments that offer an income that does not change over a period of time固定收益类投资◆They invest about $18 billion in fixed income.他们在固定收益类产品投资了大约 180 亿元。◆fixed-income trading固定收益交易