Coupon

[koo-pon, kyoo-] /ˈku pɒn, ˈkyu-/

noun
1.
a portion of a certificate, ticket, label, advertisement, or the like, set off from the main body by dotted lines or the like to emphasize its separability, entitling the holder to something, as a gift or discount, or for use as an order blank, a contest entry form, etc.
2.
a separate certificate, ticket, etc., for the same purpose.
3.
one of a number of small detachable certificates calling for periodic interest payments on a bearer bond.
Compare .
4.
Metallurgy. a sample of metal or metalwork submitted to a customer or testing agency for approval.
/ˈkuːpɒn/
noun
1.

2.
one of a number of detachable certificates attached to a bond, esp a bearer bond, the surrender of which entitles the bearer to receive interest payments
3.
one of several detachable cards used for making hire-purchase payments
4.
a ticket issued to facilitate rationing
5.
(Brit) a detachable entry form for any of certain competitions, esp football pools
n.

1822, “certificate of interest due on a bond” (which could be cut from the bond and presented for payment), from French coupon, literally “piece cut off,” from couper “to cut,” from coup “a blow” (see coup). Meaning widened to “discount ticket” 1860s by British travel agent Thomas Cook. The specific advertising sense is from 1906.

COUPON. A financial term, which, together with the practice, is borrowed from France. In the United States, the certificates of State stocks drawing interest are accompanied by coupons, which are small tickets attached to the certificates. At each term when the interest falls due, one of these coupons is cut off (whence the name); and this being presented to the State treasurer or to a bank designated by him, entitles the holder to receive the interest. [Bartlett]