39 U.S.C. § 102

1. (1)“Postal Service” means the United States Postal Service established by section 201 of this title;
2. (2)“Board of Governors”, and “Board”, unless the context otherwise requires, mean the Board of Governors established under section 202 of this title;
3. (3)“Governors” means the 9 members of the Board of Governors appointed by the President, by and with the advice and consent of the Senate, under section 202(a) of this title;
4. (4)“Inspector General” means the Inspector General appointed under section 202(e) of this title;
5. (5)“postal service” refers to the delivery of letters, printed matter, or mailable packages, including acceptance, collection, sorting, transportation, or other functions ancillary thereto;
6. (6)“product” means a postal service with a distinct cost or market characteristic for which a rate or rates are, or may reasonably be, applied;
7. (7)“rates”, as used with respect to products, includes fees for postal services;
8. (8)“market-dominant product” or “product in the market-dominant category of mail” means a product subject to subchapter I of chapter 36;
9. (9)“competitive product” or “product in the competitive category of mail” means a product subject to subchapter II of chapter 36; and
10. (10)“year”, as used in chapter 36 (other than subchapters I and VI thereof), means a fiscal year.