27 Miss. Code. R. 210-35-102
Section 25-11-103(aa) defines "withdrawal from service" or "termination from service" as the complete severance of employment from state service of an employee by resignation, dismissal, or discharge.
For purposes of setting the effective date of retirement, withdrawal from service or termination from service shall mean the cessation of the employee/employer relationship as characterized by resignation or termination from employment, with or without cause. While a member may not be performing the duties of the job, if the member has not resigned or been terminated from employment by the employer, the member is still considered employed. Where the member is on authorized leave with or without pay, such member is considered an employee and thus not terminated from employment for purposes of setting the benefit effective date.
27 Miss. Code. R. 210-35-102