Invoice. [From French envois, plural of envoy, a sending, conveyance] A written account, or letter of advice of the particulars of merchandise shipped or sent to a purchaser, consignee or factor, with the prices and charges annexed. The word does not carry a necessary implication of ownership. In United States tariff law, an invoice sent from abroad is required to be made in triplicate and signed and dated by the seller of the merchandise described therein, and subsequently verified by the American Consul or Commercial agent of the United States in the country of shipment. The three invoices are classified as original, or the importer's the duplicate, which is retained by the consul who verified it, and the triplicate, which is forwarded to the collector of the port in this country. [See Imports]