Meaning

noun the act of reducing the selling price of merchandise

noun interest on an annual basis deducted in advance on a loan

noun a refund of some fraction of the amount paid

originAlteration of French descompte, décompte, from Old French disconter, desconter (“reckon off, account back, discount”), from Medieval Latin discomputō (“to deduct, discount”), from Latin dis- (“away”) + computō (“to reckon, count”). By surface analysis, dis- + count.

Etymology from Wiktionary, CC BY-SA 3.0