from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An extension of an institution's intranet, especially over the World Wide Web, enabling communication between the institution and people it deals with, often by providing limited access to its intranet.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A private computer network that uses Internet protocols and can be accessed by authorized individuals via the Internet.
extra- + net (Wiktionary)