voucher
UK: ˈvaʊtʃə(r) | US: ˈvaʊtʃər
n. a document or coupon that can be exchanged for goods, services, or money
n. a receipt or written proof of a financial transaction
n. (historical) a person who vouches for another’s reliability
The word "voucher" originates from the Old French verb vochier (to call, summon), derived from Latin vocare (to call). The morpheme "vouch" evolved in Middle English to mean "to guarantee or attest," while the suffix "-er" denotes an agent or object performing the action. Thus, a "voucher" historically referred to a person who vouched for someone’s credibility, later shifting to its modern meaning of a document guaranteeing value or proof.
She used a discount voucher to save 20% on her purchase.
The company issued travel vouchers to employees for their business trips.
Keep your receipt as a voucher for warranty claims.
In medieval times, a lord might act as a voucher for his servant’s character.
The charity distributed food vouchers to families in need.