Final answer:
The specified date on which the principal amount of a bond is payable is referred to as maturity.
Step-by-step explanation:
The specified date on which the principal amount of a bond is payable is referred to as maturity. A bond is a debt security that includes a face value, coupon rate, and maturity date. The maturity date is when the borrower is obligated to repay the bond's face value and last interest payment to the investor.