47 CFR 1.400 : Telecommunication (§ 0.1 To Parts 401-499) — (§ 0.1 To § 19.735-203) — Federal Communications Commission (§ 0.1 To § 19.735-203) — General (§ 0.1 To § 19.735-203) — Practice And Procedure (§ 1.1 To Appendix C To Part 1) — Rulemaking Proceedings (§ 1.399 To § 1.430) — General (§ 1.399 And § 1.400) — Definitions.

As used in this subpart, the term party refers to any person who participates in a proceeding by the timely filing of a petition for rule making, comments on a notice of proposed rule making, a petition for reconsideration, or responsive pleadings in the manner prescribed by this subpart. The term does not include those who submit letters, telegrams or other informal materials.