coupon

Concise Oxford English Dictionary © 2008 Oxford University Press:
coupon/ˈkuːpɒn/

▶noun

• 1 a voucher entitling the holder to a discount on a product or a quantity of something rationed.

• 2 a detachable form used to send for a purchase or information or to enter a competition.

• 3 a detachable portion of a bond which is given up in return for a payment of interest.

  ■ the nominal rate of interest on a fixed-interest security.

• 4 Scottish & Irish a person's face.

– origin C19: from Fr., lit. ‘piece cut off’, from couper ‘cut’.