29 C.F.R. § 4231.2

The following terms are defined in § 4001.2 of this chapter: ERISA, fair market value, IRS, multiemployer plan, PBGC, plan, and plan year.

In addition, for purposes of this part:

Actuarial valuation means a valuation of assets and liabilities performed by an enrolled actuary using the actuarial assumptions used for purposes of determining the charges and credits to the funding standard account under section 302 of ERISA and section 412 of the Code.

Certified change of collective bargaining representative means a change of collective bargaining representative certified under the Labor-Management Relations Act of 1947, as amended, or the Railway Labor Act, as amended.

Fair market value of assets has the same meaning as the term has for minimum funding purposes under section 302 of ERISA and section 412 of the Code.

Merger means the combining of two or more plans into a single plan. For example, a consolidation of two plans into a new plan is a merger.

Significant transfer means the transfer of assets that equal or exceed 15% of the assets of the transferor plan before the transfer or the transfer of unfunded accrued benefits that equal or exceed 15% of the assets of the transferee plan (including a plan that did not exist prior to the transfer) before the transfer.

Transfer and transfer of assets or liabilities mean a diminution of assets or liabilities with respect to one plan and the acquisition of these assets or the assumption of these liabilities by another plan or plans (including a plan that did not exist prior to the transfer). However, the shifting of assets or liabilities pursuant to a written reciprocity agreement between two multiemployer plans in which one plan assumes liabilities of another plan is not a transfer of assets or liabilities. In addition, the shifting of assets between several funding media used for a single plan (such as between trusts, between annuity contracts, or between trusts and annuity contracts) is not a transfer of assets or liabilities.