annuitant
(3) “annuitant” means— (A) an employee who retires— (i) on an immediate annuity under subchapter III of chapter 83 of this title , or another retirement system for employees of the Government, after 5 or more years of service; (ii) under section 8412 or 8414 of this title ; (iii) for disability under subchapter III of chapter 83 of this title , chapter 84 of this title , or another retirement system for employees of the Government; or (iv) on an immediate annuity under a retirement system established for employees described in section 2105(c), in the case of an individual who elected under section 8347(q)(2) or 8461(n)(2) to remain subject to such a system; (B) a member of a family who receives an immediate annuity as the survivor of an employee (including a family member entitled to an amount under section 8442(b)(1)(A), whether or not such family member is entitled to an annuity under section 8442(b)(1)(B) ) or of a retired employee described by subparagraph (A) of this paragraph; (C) an employee who receives monthly compensation under subchapter I of chapter 81 of this title and who is determined by the Secretary of Labor to be unable to return to duty; and (D) a member of a family who receives monthly compensation under subchapter I of chapter 81 of this title as the surviving beneficiary of— (i) an employee who dies as a result of injury or illness compensable under that subchapter; or (ii) a former employee who is separated after having completed 5 or more years of service and who dies while receiving monthly compensation under that subchapter and who has been held by the Secretary to have been unable to return to duty;