As used in this subchapter⁠—

(1)  Affected source

The term “affected source” shall have the meaning given such term in subchapter IV–A.

(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 7412 of this title.

(B)  A major stationary source as defined in section 7602 of this title or part D of subchapter 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 subchapter.