Agency means an executive agency as defined in section 105 of title 5, United States Code; a legislative branch agency; a judicial agency; and the U.S. Postal Service and Postal Rate Commission.
5 CFR § 841.104
Unless otherwise defined for use in any subpart, as used in connection with FERS (parts 841 through 850 of this chapter), terms defined in 5 U.S.C. 8401 have the same meanings assigned to them by that section.