Single-employer plan
Single-employer plan means any defined benefit plan (as defined in section 3 of ERISA) that is not a multiemployer plan (as defined in section 4001(a)(3) of ERISA) and that is covered by title IV of ERISA.
Source
29 CFR § 4001.2
Scoping language
For purposes of this chapter (unless otherwise indicated or required by the context):