For the purposes of this Act the expression "receipt" includes any note, memorandum, or writing whereby any money amounting to two pounds or upwards, or any bill of exchange or promissory note for money amounting to two pounds or upwards, is acknowledged or expressed to have been received or deposited or paid, or whereby any debt or demand, or any part of a debt or demand, of the amount of two pounds or upwards, is acknowledged to have been settled, satisfied, or discharged, or which signifies or imports any such acknowledgment, and whether the same is or is not signed with the name of any person.

The duty upon a receipt may be denoted by an adhesive stamp, which is to be cancelled by the person by whom the receipt is given before he delivers it out of his hands.