cash - money in the form of coin and banknotes float - the sum of money held in an imprest account imprest system - the method usually ysed in running the petty cash arrangements in an office. The petty cashier is advanced sufficient money to pay the expected expenses for a given period. He keeps an account called an imprest or petty cahs account of all he spends, and at the end of the period he is given a sum in cash equal to the amount he has spent; his cash in hand (the cash he holds) is thus brought up to the amount he originally started with. The fixed sum held at the beginning of each period is called a cash float., raha paberraha ja müntidena