MEDIUM n.
prepared for application. Circulating medium, a current medium of exchange, whether coin, bank notes, or government notes. -- Ethereal medium (Physics), the ether. -- Medium of exchange, that which is used for effecting an exchange of commodities -- money or current representatives of money.
MONEY n.
Any written or stamped promise, certificate, or order, as a government note, a bank note, a certificate of deposit, etc., which is payable in standard coined money and is lawfully current in lieu of it; in a comprehensive sense, any currency usually and lawfully employed in buying and selling.