; and (2) with full recognition of the constitutional right of either House to change the rules (so far as relating to the procedure of that House) at any time, in the same manner, and to the same extent as in the case of any other rule of that House. (f) Definitions In this section, the following definitions apply: (1) Agency The term agency has the meaning given the term in section 551(1) of title 5, United States Code. (2) Rule The term rule has the meaning given the term in section 551(4) of title 5, United States Code. (3) Regular appropriation bill The term regular appropriation bill means any annual appropriation bill which, with respect to the Congress involved, is under the jurisdiction of a single subcommittee of the Committee on Appropriations of the House of Representatives (pursuant to the Rules of the House of Representatives for that Congress) and a single subcommittee of the Committee on Appropriations of the Senate (pursuant to the Standing Rules of the Senate). (g) Effective date This section shall take effect on the date of the enactment of this Act.