voucher

A piece of paper or other token that entitles the holder to a discount, or that can be exchanged for goods and services.

a voucher for a free kettle

This voucher entitles the bearer to a 20% discount on frozen goods.

A receipt.

One who or that which vouches.

To the fashionable world he cannot be a stranger […] and his having married a sister of the Duke of Leeds is a voucher for my assertion.

She is my sister—my own father’s daughter. Well; why do I believe it? The other day I had not so much as heard the remotest rumor of her existence; and what has since occurred to change me? What so new and incontestable vouchers have I handled? None at all.

A copy of a published advertisement sent by the agency to the client as proof of publication.

Most agencies also have a vouchers department. It is its responsibility to obtain a copy of every advertisement that appears in print. It supplies the accounts department with the relevant newspaper or magazine, which is affixed to the agency's invoice for the space.

A mechanical device used in shops for automatically registering the amount of money drawn.

To establish the authenticity of; to vouch for.

To provide a vouch for (an expenditure).

To provide (a beneficiary) with a voucher.