[wikipedia] a legal agreement by which a bank or other creditor lends money at interest in exchange for taking title of the debtor's property, with the condition that the conveyance of title becomes void upon the payment of the debt.
[dictionary] The percentage of a loan that is charged as interest by the lender to the borrower, expressed as an APR (annual percentage rate) of the remaining loan
[mtgprofessor] how many years the borrower has to repay the mortgage
Adjustable Rate Mortgage
[investopedia] a mortgage loan with the interest rate on the note periodically adjusted based on an index which reflects the cost to the lender of borrowing on the credit markets
Fixed Rate Mortgage
[bankrate] A mortgage in which the monthly payment based on interest does not change