A document that a supplier issues to a customer, following a genuine mistake or overcharge, or an agreed change in the value of supply. HM Customs & Revenue Glossary
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credit note UK US noun [C] UK (US credit memo, also US credit receipt)
► COMMERCE a document that a seller gives to a buyer who returns a product, pays too much for something, etc., which the buyer may use at a later time to pay for something else: »
Most shops will allow you to make an exchange or offer you a credit note instead of a refund.
»Incorrect invoices may need to be adjusted by means of a credit note issued by the supplier.
Financial and business terms. 2012.