---
kind: "unit"
title: "29"
title_heading: "Labor"
key: "subtB/chXL/subchA/part4001"
level: "part"
label: "Part 4001"
heading: "Terminology"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/29/subtB-chXL-subchA-part4001"
sections_count: 3
---

# Part 4001 — Terminology

Title 29 C.F.R. — Labor › Subtitle B — Regulations Relating to Labor › Chapter XL — Pension Benefit Guaranty Corporation › Subchapter A — General

## Sections

- [§4001.1. Purpose and scope.](/cfr/29/4001.1.md)
- [§4001.2. Definitions.](/cfr/29/4001.2.md)
- [§4001.3. Trades or businesses under common control; controlled groups.](/cfr/29/4001.3.md)