Site Navigation: A Few Helpful Definitions
http://www.adaptivepath.com/ideas/essays/archives/000048.php

Young, Indi
Adaptive Path
2002

Abstract:

Every site has structure, and visitors will form their first and most lasting impressions of that structure by looking at the links, buttons, tabs, and other controls that form the “navigation.” As designers, we’re very concerned with creating a navigation scheme and interface that makes it easy for the user to understand what they can do and where they can go. But collaborating with your team on the design of a navigation system can be difficult unless you all share the same vocabulary when talking about the different parts that make up the navigation UI.