US lawFederal (United States)RegulationsTitle 48 CFR — Federal Acquisition Regulations SystemChapter 1 — FEDERAL ACQUISITION REGULATIONPart 15 — CONTRACTING BY NEGOTIATIONSubpart 15.5—Preaward, Award, and Postaward Notifications, Protests, and Mistakes15.50148 C.F.R. § 15.501Definition.Last amended: 2017Year: 2026Length: 13 wordsOfficial source Cite as 48 C.F.R. § 15.501 (2026)Day, as used in this subpart, has the meaning set forth at 33.101.Next48 C.F.R. § 15.502