To deduct an amount from the usual price of something. The store decided to discount all summer clothing by 20%.
To regard something as being unworthy of consideration because it lacks credibility. She discounted his opinion because he had no experience in the field.
To purchase or value a bill, bond, or other future payment at less than its nominal value, especially to account for interest or risk. The notes were discounted by the bank at an annual rate of five percent.