(accounting) The amount by which debits exceed credits. / (banking, finance) The amount of money owed to a particular creditor.

(accounting) A commercial document issued by a seller in order to adjust upwards the amount of an invoice already issued.

(aviation, travel) An official notification that a travel agency has underpaid an airline for a ticket or similar, or is being fined by the airline for failure to adhere to fare rules or airline policy.

plural of agency debit memo