Mo. Rev. Stat. § 21.550: Definition.

The phrase "state and local public employee retirement systems" , as used in sections 21.550 to 21.564*, unless a different meaning is plainly required by the context, shall mean: any retirement system established by the state of Missouri or any political subdivision or instrumentality of the state for the purpose of providing retirement plan benefits for elected or appointed public officials or employees of the state of Missouri or any political subdivision of the state.