As used in this subchapter, unless the context otherwise requires:
(1) “Contribution” means a percentage of payroll expenditures paid to the Workers' Compensation Revolving Fund by a state agency in order to provide current and timely reimbursements of benefits paid by the Workers' Compensation Commission for workers' compensation benefits charged to the agency;
(2) “Experience rate” means the process of adjustment in a future period of the contribution rate of a state agency based on the difference of the amounts paid to the Workers’ Compensation Revolving Fund for a fiscal year compared to the amounts of workers' compensation benefits charged to the agency for a fiscal year in order to recover deficits and refund surpluses;
(3) “Payroll” means the gross total amount expended for a payroll period for regular salaries, extra help, and authorized overtime payments; and
(4) “State agency” means any state agency, board, commission, department, institution, college, university, and community junior college receiving appropriation for regular salaries, extra help, and authorized overtime payable from funds deposited into the State Treasury or depositories other than the State Treasury by the General Assembly.