cou ‧ pon /ˈkuːpɒn $ -pɑːn/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: French ; Origin: Old French , 'piece' , from couper 'to cut' ]
1 . a small piece of printed paper that gives you the right to pay less for something or get something free:
The coupon entitles you to ten cents off your next purchase.
2 . a printed form, used when you order something, enter a competition etc:
To order, fill in the coupon on page 154.