CFR›Title 9›Chapter III›9 CFR Part 531 Citation9 CFR Part 531ContainsSection § 531.1CorpusDaily eCFRDisplayed edition2026-10-13Last updated2026-10-13 PART 531—DEFINITIONS Sections § 531.1 § 531.1 Definitions. Authority7 U.S.C. 138f; 7 U.S.C. 450; 21 U.S.C. 601-602, 606-622, 624-695; 7 CFR 2.7, 2.18, 2.53.