1. documents that can be exchanged for goods, services, or discounts
Usage: plural of voucher
2. documents that serve as proof of a transaction or expenditure
Usage: business/accounting context

Examples

• The restaurant gave us vouchers for a free meal.
• She collected discount vouchers from various stores.
• The company requires vouchers for all business expenses.
• Gift vouchers make popular holiday presents.
• Students received meal vouchers for the cafeteria.
• The accounting department filed all payment vouchers.
• Travel vouchers must be submitted within 30 days.