discount
nounA sum deducted for prompt or advanced payment; an allowance or deduction from a sum due, or from a credit; a certain rate per cent deducted from the credit price of goods sold, on account of prompt payment; or any deduction from the customary price, or from a sum due or to be due at a future time. Thus the merchant who gives a credit of three months will deduct a certain rate per cent for payment in hand, and the holder of a note or bill of exchange will deduct a certain rate per cent of the amount of the note or bill for advanced payment, which deduction is called a discount.