40 CFR § 65.81 - Definitions.

---
identifier: "/us/cfr/t40/s65.81"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 65.81 - Definitions."
title_number: 40
title_name: "Protection of Environment"
section_number: "65.81"
section_name: "Definitions."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "65"
part_name: "CONSOLIDATED FEDERAL AIR RULE"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "65 FR 78285, Dec. 14, 2000, unless otherwise noted."
cfr_part: "65"
---


# 65.81 Definitions.

All terms used in this subpart shall have the meaning given them in the Act and in subpart A of this part. If a term is defined in both subpart A of this part and in other subparts that reference the use of this subpart, the term shall have the meaning given in subpart A of this part for purposes of this subpart.