29 CFR § 4221.2 - Definitions.
---
identifier: "/us/cfr/t29/s4221.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "29 CFR § 4221.2 - Definitions."
title_number: 29
title_name: "Labor"
section_number: "4221.2"
section_name: "Definitions."
chapter_name: "PENSION BENEFIT GUARANTY CORPORATION"
subchapter_number: "I"
subchapter_name: "WITHDRAWAL LIABILITY FOR MULTIEMPLOYER PLANS"
part_number: "4221"
part_name: "ARBITRATION OF DISPUTES IN MULTIEMPLOYER PLANS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "29 U.S.C. 1302(b)(3), 1401."
regulatory_source: "61 FR 34109, July 1, 1996, unless otherwise noted."
cfr_part: "4221"
---
# 4221.2 Definitions.
The following terms are defined in § 4001.2 of this chapter: ERISA, IRS, multiemployer plan, PBGC, plan, and plan sponsor.
In addition, for purposes of this part:
*Arbitrator* means an individual or panel of individuals selected according to this part to decide a dispute concerning withdrawal liability.
*Employer* means an individual, partnership, corporation or other entity against which a plan sponsor has made a demand for payment of withdrawal liability pursuant to section 4219(b)(1) of ERISA.
*Party* or *parties* means the employer and the plan sponsor involved in a withdrawal liability dispute.
*Withdrawal liability dispute* means a dispute described in § 4221.1(a) of this chapter.