SEC. 501. DEFINITIONS.
  As used in this title- 
       (1) Affected  source.-   The term "affected  source" shall
     have the meaning given such term in title IV.
       (2)  Major source.-   The  term "major  source" means  any
     stationary  source  (or  any  group  of  stationary  sources
     located within  a contiguous area and  under common control)
     that is either of the following:
          (A) A major source as defined in section 112.
          (B) A major stationary source as defined in section 302
       or part D of title I.
       (3)  Schedule  of  compliance.-   The  term  "schedule  of
     compliance" means a schedule of remedial measures, including
     an enforceable sequence of actions or operations, leading to
     compliance  with an applicable implementation plan, emission
     standard, emission limitation, or emission prohibition.
       (4)  Permitting   authority.-     The   term   "permitting
     authority" means  the  Administrator or  the  air  pollution
     control agency authorized by  the Administrator to carry out
     a permit program under this title.
[42 U.S.C. 7661]