56.805.  Definitions. — As used in sections 56.800 to 56.840, the following words and terms mean:

  (1)  "Annuity", annual payments, made in equal monthly installments, to a retired member from funds provided for, in, or authorized by, the provisions of sections 56.800 to 56.840;

  (2)  "Average final compensation", the average compensation of an employee for the two consecutive years prior to retirement when the employee's compensation was greatest;

  (3)  "Board of trustees" or "board", the board of trustees established by the provisions of sections 56.800 to 56.840;

  (4)  "Compensation", all salary and other compensation payable by a county to an employee for personal services rendered as an employee, including any salary reduction amounts under a cafeteria plan that satisfies 26 U.S.C. Section 125 or an eligible deferred compensation plan that satisfies 26 U.S.C. Section 457 but not including reimbursement for any expenses, any consideration for agreeing to terminate employment, or any other nonrecurring or unusual payment that is not part of regular remuneration;

  (5)  "County", the City of St. Louis and each county in the state;

  (6)  "Creditable service", the sum of both membership service and creditable prior service;

  (7)  "Effective date of the establishment of the system", August 28, 1989;

  (8)  "Employee", an elected or appointed prosecuting attorney or circuit attorney who is employed by a county or a city not within a county;

  (9)  "Membership service", service as a prosecuting attorney or circuit attorney after becoming a member that is creditable in determining the amount of the member's benefits under this system;

  (10)  "Prior service", service of a member rendered prior to the effective date of the establishment of the system^* which is creditable under section 56.823;

  (11)  "Retirement system" or "system", the prosecuting attorneys and circuit attorneys' retirement system authorized by the provisions of sections 56.800 to 56.840.