(general) An interest-bearing certificate of debt, usually issued in series, by which the issuer obligates itself to pay the principal amount at a specified time and to pay interest periodically.
(banking) An instrument used as proof of a debt.
(finance) The obligation to answer for the debt of another person.
(insurance) A contract between a principal and a surety (insurance company or their agent) which is obtained to insure performance of an obligation (often imposed by law or regulation).
(U.S. Customs) A bond required by the federal government in connection with the payment of duties or to produce documentation. U.S. Customs entries must be accompanied by evidence that a surety bond is posted with Customs to cover any potential duties, taxes and penalties which may accrue. Bonds may be secured through a resident U.S. surety company, but may also be posted in the form of United States money or certain United States government obligations. In the event that a customs broker is employed for the purpose of making entry, the broker may permit the use of his or her bond to provide the required coverage. See bond system; surety; in bond.