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1. Interest - Interest, in finance and economics, is payment from a borrower or deposit-taking financial institution to a lender or depositor of an amount above repayment of the principal sum, at a particular rate. It is distinct from a fee which the borrower may pay the lender or some third party.
2. Simple Interest - Simple interest is a method to calculate the amount of interest charged on a sum at a given rate and for a given period of time.
3. Compound Interest - Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest. It is the result of reinvesting interest, rather than paying it out, so that interest in the next period is then earned on the principal sum plus previously accumulated interest.
4. Maturity Value - Maturity value is the amount due and payable to the holder of a financial obligation as of the maturity date of the obligation. The term usually refers to the remaining principal balance on a loan or bond. In the case of a security, maturity value is the same as par value.
5. Principal Amount - Principal amount on a loan is the amount borrowed. In the context of borrowing, principal is the initial size of a loan; it can also be the amount still owed on a loan.
I am not really sure about it's definition, because I don't know your topic/lesson, but I hope it helps.
