25 U.S. Code § 3402 - Definitions
The terms “Indian tribe” and “tribe” shall have the meaning given the term “Indian tribe” in section 450b(e) of this title.
The term “Indian” shall have the meaning given such term in section 450b(d) of this title.
Except where otherwise provided, the term “Secretary” means the Secretary of the Interior.
 So in original. Probably should be capitalized.