(5) State. For purposes of paragraph (4) of this definition, the term State means any state of the United States, the District of Columbia, Puerto Rico, the U.S. Virgin Islands, or any other possession of the United States.
17 CFR § 1.3
Words used in the singular form in the rules and regulations in this chapter shall be deemed to import the plural and vice versa, as the context may require. The following terms, as used in the Commodity Exchange Act, or in the rules and regulations in this chapter, shall have the meanings hereby assigned to them, unless the context otherwise requires: