yield
The ratio of investment income to the total amount invested over a given period of time.

yield curve
A graphic representation of market yield for a fixed income security plotted against the maturity of the security.

yield maintenance
The prepayment premium which will equal the present value of any costs to the lender resulting from the difference in interest rates between the date of the note and the date on which the prepayment is made.

yield to maturity
The lender's percentage of annual return on actual funds loaned, assuming that the loan will be paid in full at maturity.