31 C.F.R. § 597.316

The term transaction shall have the meaning set forth in 18 U.S.C. 1956(c)(3), as from time to time amended. As of the effective date, this term includes a purchase, sale, loan, pledge, gift, transfer, delivery, or other disposition of any asset, and with respect to a financial institution includes a deposit, withdrawal, transfer between accounts, exchange of currency, loan, extension of credit, purchase or sale of any stock, bond, certificate of deposit, or other monetary instrument, use of a safe deposit box, or any other payment, transfer, or delivery by, through, or to a financial institution, by whatever means effected.