; (2) the term tribal enterprise means any business enterprise, regardless of whether incorporated or unincorporated under Federal or tribal law, of an Indian tribe or group of Indian tribes; (3) the term Indian reservation has the meaning given that term in section 168(j)(6) of the Internal Revenue Code of 1986; (4) the term Indian tribe has the meaning given that term in section 4(e) of the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 450b(e) ); and (5) the terms tobacco products and processed tobacco have the meanings given such terms by section 5702 of the Internal Revenue Code of 1986.