The following words and terms, when used in this part, have the following meanings, unless the context clearly indicates otherwise:
Chairperson- The Chairperson of the Commission.
Commission- The Navigation Commission for the Delaware River and its navigable tributaries.
Department- The Department of State of the Commonwealth.
Navigable tributaries- Tidal portions of the navigable tributaries are defined as follows:
River- Tidal portions of the Delaware River, from the Delaware border in the South to the Railroad Bridge at Morrisville in the North, and its navigable tributaries within this Commonwealth.
Secretary- The Secretary of the Commonwealth.
4 Pa. Code § 401.1