In this chapter, the following terms have the meanings indicated. Terms Defined. “Member” means a member or vested former member of a State system. “Regular interest” means interest at the rate payable on accumulated contributions as provided under State Personnel and Pensions Article, Division II, Annotated Code of Maryland, for each State system. Retirement. “Retirement” means the grant of a retirement allowance under State Personnel and Pensions Article, Division II, Annotated Code of Maryland, after separation from employment with a participating employer. “Retirement” includes the grant of a vested allowance under State Personnel and Pensions Article, Title 29, Subtitle 3, Annotated Code of Maryland.