A loan whose rate is fixed for the life of the loan.
A loan on which the rate paid by the borrower is fixed for the life of the loan. 
A loan with the same interest rate and monthly payment over the life of the loan.
A one-time offer to purchase a stated number of shares at a stated fixed price, usually at a premium
A loan where the interest rate does not change during the term of the loan.
In fixed rate loans, the interest rate remains the same through the duration of the loan. This means the monthly installments are always the same.