Customs duty.

Customs duty. Customs duty means any customs or import duty and a charge of any kind imposed in connection with the importation of a good, including any form of surtax or surcharge in connection with such importation, other than any:
(1) Charge equivalent to an internal tax imposed consistently with Article III:2 of the General Agreement on Tariffs and Trade, or any equivalent provision of a successor agreement to which the United States, Canada and Mexico are party, in respect of like, directly competitive or substitutable goods of the United States, Canada or Mexico, or in respect of goods from which the imported good has been manufactured or produced in whole or in part;
(2) Antidumping or countervailing duty that is applied pursuant to the domestic law of the United States, Canada or Mexico and that is not applied inconsistently with Chapter Nineteen of the NAFTA;
(3) Fee or other charge in connection with importation commensurate with the cost of services rendered;
(4) Premium offered or collected on an imported good arising out of any tendering system in respect of the administration of quantitative import restrictions, tariff rate quotas or tariff preference levels; and
(5) Fee applied pursuant to section 22 of the U.S. Agricultural Adjustment Act, subject to the provisions of Chapter Seven of the NAFTA.

Source

19 CFR § 181.1

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Scoping language

As used in this part, the following terms shall have the meanings indicated unless either the context in which they are used requires a different meaning or a different definition is prescribed for a particular subpart, section or other portion of this part:

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