Extranet
ahd-5
noun.
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.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A
private
computer
network
that uses
Internet
protocols
and can be
accessed
by
authorized
individuals via the Internet.