(a) For the purposes of subchapters I to IV of this chapter—

(1) The term "person" includes partnerships, corporations, and associations.

(2) The term "United States", when used in a geographical sense, means the States, the District of Columbia, the Territories of Alaska and Hawaii, and Puerto Rico.

(3) The term "ordinary customs duty" means a customs duty based on the article as such (whether or not such duty is also based in any manner on the use, value, or method of production of the article, or on the amount of like articles imported, or on any other factor); but does not include—

(A) a customs duty based on an act or omission of any person with respect to the importation of the article, or of the country from which the article is exported, or from which it comes; or

(B) a countervailing duty imposed to offset a subsidy, bounty, or grant; or

(C) an anti-dumping duty imposed to offset the selling of merchandise for exportation at a price less than the prevailing price in the country of export; or

(D) any tax, fee, charge, or exaction, imposed on or in connection with importation unless the law of the country imposing it designates or imposes it as a customs duty or contains a provision to the effect that it shall be treated as a duty imposed under the customs laws; or

(E) the tax imposed by section 2491(c) of the Internal Revenue Code with respect to an article, merchandise, or combination, 10 per centum or more of the quantity by weight of which consists of, or is derived directly or indirectly from, one or more of the oils, fatty acids, or salts specified in section 2470 of the Internal Revenue Code; or the tax imposed by section 3500 of the Internal Revenue Code.

(4) The term "Philippine article" means an article which is the product of the Philippines, unless, in the case of an article produced with the use of materials imported into the Philippines from any foreign country (except the United States) the aggregate value of such imported materials at the time of importation into the Philippines was more than twenty per centum of the value of the article imported into the United States, the value of such article to be determined in accordance with, and as of the time provided by, the customs laws of the United States in effect at the time of importation of such article. As used in this paragraph the term "value", when used in reference to a material imported into the Philippines, includes the value of the material ascertained under the customs laws of the Philippines in effect at the time of importation into the Philippines, and, if not included in such value, the cost of bringing the material to the Philippines, but does not include the cost of landing it at the port of importation, or customs duties collected in the Philippines. For the purposes of this paragraph any imported material, used in the production of an article in the Philippines, shall be considered as having been used in the production of an article subsequently produced in the Philippines, which is the product of a chain of production in the Philippines in the course of which an article, which is the product of one stage of the chain, is used by its producer or another person, in a subsequent stage of the chain, as a material in the production of another article.

(5) The term "United States article" means an article which is the product of the United States, unless, in the case of an article produced with the use of materials imported into the United States from any foreign country (except the Philippines) the aggregate value of such imported materials at the time of importation into the United States was more than twenty per centum of the value of the article imported into the Philippines, the value of such article to be determined in accordance with, and as of the time provided by, the customs laws of the Philippines in effect at the time of importation of such article. As used in this paragraph the term "value", when used in reference to a material imported into the United States, includes the value of the material ascertained under the customs laws of the United States in effect at the time of importation into the United States, and, if not included in such value, the cost of bringing the material to the United States, but does not include the cost of landing it at the port of importation, or customs duties collected in the United States. For the purposes of this paragraph any imported material, used in the production of an article in the United States, shall be considered as having been used in the production of an article subsequently produced in the United States, which is the product of a chain of production in the United States in the course of which an article, which is the product of one stage of the chain, is used by its producer or another person, in a subsequent stage of the chain, as a material in the production of another article.

(6) The term "United States duty" means the rate or rates of ordinary customs duty which (at the time and place of entry, or withdrawal from warehouse, in the United States for consumption, of the Philippine article) would be applicable to a like article if imported from that foreign country which is entitled to the lowest rate, or the lowest aggregate of rates, of ordinary customs duty with respect to such like article.

(7) The term "Philippine duty" means the rate or rates of ordinary customs duty which (at the time and place of entry, or withdrawal from warehouse, in the Philippines for consumption, of the United States article) would be applicable to a like article if imported from that foreign country which is entitled to the lowest rate, or the lowest aggregate of rates, of ordinary customs duty with respect to such like article.

(8) The term "internal tax" includes an internal fee, charge, or exaction, and includes—

(A) the tax imposed by section 2491(c) of the Internal Revenue Code with respect to an article, merchandise, or combination, 10 per centum or more of the quantity by weight of which consists of, or is derived directly or indirectly from, one or more of the oils, fatty acids, or salts specified in section 2470 of the Internal Revenue Code; and the tax imposed by section 3500 of the Internal Revenue Code; and

(B) any other tax, fee, charge, or exaction, imposed on or in connection with importation unless the law of the country imposing it designates or imposes it as a customs duty or contains a provision to the effect that it shall be treated as a duty imposed under the customs laws.

(b) For the purposes of sections 1271(b) and 1311(b) of this title, any material, used in the production of an article, shall be considered as having been used in the production of an article subsequently produced, which is the product of a chain of production in the course of which an article, which is the product of one stage of the chain, is used by its producer or another person, in a subsequent stage of the chain, as a material in the production of another article.

(c) For the purposes of paragraphs (6) and (7) of subsection (a) of this section—

(1) if an article is entitled to be imported from a foreign country free of ordinary customs duty, that country shall be considered as the country entitled to the lowest rate of ordinary customs duty with respect to such article; and

(2) a reduction in ordinary customs duty granted any country, by law, treaty, trade agreement, or otherwise, with respect to any article, shall be converted into the equivalent reduction in the rate of ordinary customs duty otherwise applicable to such article.

(d) The terms "includes" and "including" when used in a definition contained in subchapters I to IV of this chapter shall not be deemed to exclude other things otherwise within the meaning of the term defined.