Okla. Admin. Code § 590:10-21-2
The following words or terms, when used in this Subchapter, shall have the following meaning, unless the context clearly indicates otherwise:
"Administrator" means the System.
"Beneficiary" means any person named by a member to receive any benefits as provided by 74 O.S. §§ 901 et seq. If there is no beneficiary living at the time of member employee's death, the member's estate shall be the beneficiary.
"Board" means the Oklahoma Public Employees Retirement System Board of Trustees.
"Code" means the Internal Revenue Code of 1986, as amended, as applicable to a governmental plan, or corresponding provisions of any subsequent federal income tax law.
"Excess Benefit" means the benefit determined in accordance with 590:10-21-5(a) and Section 4.01 of the Excess Benefit Plan document.
"Excess Benefit Fund" means the trust fund established by the Board pursuant to Article VI of the Excess Benefit Plan document, pursuant to the provisions of 74 O.S. § 915.1, and as set forth in 590:10-21-7.
"Excess Benefit Plan" means the "Oklahoma Public Employees Retirement System Excess Benefit Plan and Trust" established pursuant to Code Section 415 and 74 O.S. §915.1.
"OPERS Plan" refers to the retirement plan administered by the Oklahoma Public Employees Retirement System. The OPERS Plan document consists of the applicable Oklahoma statutes and rules and regulations.
"Participant" means a Retiree or Beneficiary who is entitled to benefits under the Excess Benefit Plan.
"Participating Employer" means an eligible employer who has agreed to make contributions to the System on behalf of its employees, provided such employer is the State, a political subdivision of the State, or an agency or instrumentality of the State. No employer which is not permitted to participate in a qualified governmental pension plan as defined in Code Section 414(d) shall be permitted to participate in the Excess Benefit Plan.
"Plan Year" means the calendar year for the purpose of this Excess Benefit Plan.
"Retiree" means a member who has retired under the System.
"Retirement Benefit" means a monthly income with benefits accruing from the first day of the month coinciding with installments by the Plan, whether payable for a temporary period or following retirement and ending on the last day of the month in which death occurs throughout the future life of a Retired Member or the actuarial equivalent thereof paid in such manner as specified by the member pursuant to 74 O.S. §§ 901 et seq. or as otherwise allowed to be paid at the discretion of the Board, without regard to any limitations on such retirement income or benefit under Code Section 415(b).
"Retirement Fund" means the reserves of the System.
"State" means the State of Oklahoma.
"System" means the Oklahoma Public Employees Retirement System.
"Trustees" means the members of the Board.
Okla. Admin. Code § 590:10-21-2