Except as otherwise provided in section 5707(d),¹ for the purpose of this subchapter—

(1) “agency” means—

(A) an Executive agency;

(B) a military department;

(C) an office, agency, or other establishment in the legislative branch;

(D) an office, agency, or other establishment in the judicial branch; and

(E) the government of the District of Columbia;

but does not include—

(i) a Government controlled corporation;

(ii) a Member of Congress; or

(iii) an office or committee of either House of Congress or of the two Houses;

(2) “employee” means an individual employed in or under an agency including an individual employed intermittently in the Government service as an expert or consultant and paid on a daily when-actually-employed basis and an individual serving without pay or at $1 a year;

(3) “subsistence” means lodging, meals, and other necessary expenses for the personal sustenance and comfort of the traveler;

(4) “per diem allowance” means a daily payment instead of actual expenses for subsistence and fees or tips to porters and stewards;

(5) “Government” means the Government of the United States and the government of the District of Columbia; and

(6) “continental United States” means the several States and the District of Columbia, but does not include Alaska or Hawaii.