For the purpose of this chapter, the following terms shall have the respective meanings ascribed to them by this section except where the context clearly indicates a different meaning:
(1) COMMISSIONER. The Commissioner of the Department of Revenue of the State of Alabama.
(2) DEPARTMENT. The Alabama Department of Revenue.
(3) PARI-MUTUEL. A system of betting on races whereby the winners divide the total amount bet, after deducting authorized taxes, fees and management expenses, in proportion to the sums wagered individually.
(4) PARI-MUTUEL POOL. The total amount wagered under the pari-mutuel betting system in any particular race.