What does "cash" mean?

Cash: (Com.) (a) Ready money; especially, coin or specie; but also applied to bank notes, drafts, bonds, or any paper easily convertible into money. (b) Immediate or prompt payment in current funds; as, to sell goods for cash; to make a reduction in price for cash. Cash account (Bookkeeping), an account of money received, disbursed, and on hand. -- Cash boy, in large retail stores, a messenger who carries the money received by the salesman from customers to a cashier, and returns the proper change. [Colloq.] -- Cash credit, an account with a bank by which a person or house, having given security for repayment, draws at pleasure upon the bank to the extent of an amount agreed upon; -- called also bank credit and cash account. -- Cash sales, sales made for ready, money, in distinction from those on which credit is given; stocks sold, to be delivered on the day of transaction.