BANKER, com. law. A banker is one engaged in the business of receiving other persons money in deposit, to be returned on demand discounting other persons' notes, and issuing his own for circulation. One who performs the business usually transacted by a bank. Private bankers are generally not permitted. 2. The business of bankers is generally performed through the medium of incorporated banks. 3. A banker may be declared a bankrupt by adverse proceedings against him. Act of Congress of 19th Aug. 1841. See 1 Atk. 218; 2 H. Bl. 235; 1 Mont. B. L. 12. 4. Among the ancient Romans there were bankers called argentarii, whose office was to keep registers of contracts between individuals, either to loan money, or in relation to sales and stipulations. These bankers frequently agreed with the creditor to pay him the debt due to him by the debtor. Calvini Lex. Jurid.