For purposes of this chapter
(1) Repealed. Pub. L. 93–618, title VI, § 602(d), Jan. 3, 1975, 88 Stat. 2072.
(2) The term duty or other import restriction includes
(A) the rate and form of an import duty, and
(B) a limitation, prohibition, charge, and exaction other than duty, imposed on importation or imposed for the regulation of imports.
(3) to (5) Repealed. Pub. L. 93–618, title VI, § 602(d), Jan. 3, 1975, 88 Stat. 2072.
(6) The term modification, as applied to any duty or other import restriction, includes the elimination of any duty.