6 U.S.C. § 1101
Definitions
For purposes of this subchapter, the following terms apply:
(1) Department
The term “Department” means the Department of Homeland Security.
(2) Secretary
The term “Secretary” means the Secretary of Homeland Security.
( Pub. L. 110–53, title XII, § 1201 , Aug. 3, 2007 , 121 Stat. 381 .)