(b) Definitions.— For purposes of subsection (a)
(1) the term retirement system for Federal military or civilian personnel means a pension or annuity system for Federal military or civilian personnel of more than one agency, or for some or all of such personnel of a single agency, established by statute or by regulation pursuant to statutory authority; and
(2) the term qualified retirement arrangement means a plan qualified under section 401(a), 403(a), or 409 of the Internal Revenue Code of 1986 or a plan that is subject to the requirements of section 205 of the Employee Retirement Income Security Act of 1974.