/ ˈkuːpɒn; NAmE -pɑːn; ˈkjuː-/ noun
1.
a small piece of printed paper that you can exchange for sth or that gives you the right to buy sth at a cheaper price than normal :
money-off coupons
clothing coupons
an international reply coupon
2.
a printed form, often cut out from a newspaper, that is used to enter a competition, order goods, etc. :
Fill in and return the attached coupon.
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WORD ORIGIN
early 19th cent. (denoting a detachable portion of a stock certificate): from French , literally piece cut off , from couper cut, from Old French colper , from cop , colp a blow, via Latin from Greek kolaphos blow with the fist.