From Longman Business Dictionarycapital sumˌcapital ˈsum1FINANCE a single amount of money paid out to an investor by an investment, rather than a series of paymentsCorporate bonds pay a fixed rate of interest and then a capital sum on the bond’s maturity.2INSURANCE a single payment to an insured person if certain conditions are metAn endowment policy pays a capital sum to the insured at a specified time in the future. → sum
