As used in this chapter- (a) The term "person" means an individual, partnership, corporation, association, or any other form of business enterprise. (b) The term "commerce" means commerce among the several States or with foreign nations or in any territory of the United States or in the District of Columbia or between any such territory and another, or between any such territory and any State or foreign nation, or between the District of Columbia or the Commonwealth of Puerto Rico and any State or