US lawFederal (United States)RegulationsTitle 5 CFR — Administrative PersonnelChapter VI — FEDERAL RETIREMENT THRIFT INVESTMENT BOARDPart 1640 — PERIODIC PARTICIPANT STATEMENTS1640.15 C.F.R. § 1640.1Definitions.Last amended: 2017Year: 2026Length: 15 wordsOfficial source Cite as 5 C.F.R. § 1640.1 (2026)Definitions generally applicable to the Thrift Savings Plan are set forth at 5 CFR 1690.1.Cross-references to the CFR5:1690.1.Next5 C.F.R. § 1640.2