Coupon (noun)

1. A document or a code that can be exchanged for a financial discount or rebate when purchasing a product or service.
2. A certificate that can be exchanged for a specific item or service.

Origin:

The word coupon comes from the french word "couper" which means "to cut" and it first appeared in the english language in the 19th century.

Examples:

1. I used a coupon to get a discount on my purchase.
2. The store had a sale and offered an extra 20% off with a coupon.
3. I got a coupon in the mail for a free oil change at the auto shop.
4. The restaurant was offering a buy-one-get-one-free coupon in the newspaper.
5. I"m going to use my coupon for a free spa day at the hotel"s spa.