---
kind: "section"
citation: "40 C.F.R. § 63.11144"
title: "40"
number: "63.11144"
heading: "What definitions apply to this subpart?"
url: "https://uscodex.org/cfr/40/63.11144"
---

# §63.11144. What definitions apply to this subpart?

- (a) On and before April 17, 2012, the terms used in this subpart are defined in the Clean Air Act; §§ [61.02](/cfr/40/61.02.md) and [61.61](/cfr/40/61.61.md) of this chapter; and [§ 63.2](/cfr/40/63.2.md) for terms used in the applicable provisions of [subpart A](/cfr/40/subpartA.md) of this part, as specified in [§ 63.11143(b)](/cfr/40/63.11143.md?p=b).
- (b) After April 17, 2012, terms used in this subpart are defined in the Clean Air Act; [§ 63.2](/cfr/40/63.2.md); and [§ 63.12005](/cfr/40/63.12005.md).

## Notes

### Amendments

[77 FR 22906, Apr. 17, 2012]

### Source

Source: 72 FR 2943, Jan. 23, 2007, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.

### Amendments

[77 FR 22906, Apr. 17, 2012]