Nationwide permit refers to a type of general permit which authorizes activities on a nationwide basis unless specifically limited. (Another type of general permit is a regional permit which is issued by division or district engineers on a regional basis in accordance with 33 CFR part 325). (See 33 CFR 322.2(f) and 323.2(h) for the definition of a general permit.)
33 CFR § 330.2
The definitions found in 33 CFR parts 320-329 are applicable to the terms used in this part.