¿Cuales son las definiciones más corrientes para los siguientes conceptos?

1) Hypertext:
Hypertext , a term coined by Theodor H. Nelson in the 1960s, refers also to a form of electronic text, a radically new information technology, and a mode of publication.Hypertext, as the term is used in this work, denotes text composed of blocks of text and the electronic links that join them.
URL: http://www.cyberartsweb.org/cpace/ht/jhup/history.html
 

2) Link:
When you are on a Web page and you see the blue, often underlined text, that makes the cursor from your mouse change shape, that is a link. If you click on a link it will take you to another page or another site.
URL: http://personalweb.about.com/cs/glossary/g/link.htm

3) Lexia:
A text composed of blocks of electronic links
URL: http://www.cyberartsweb.org/cpace/ht/jhup/history.html

4) Node:
A node is any device connected to a computer network. Nodes can be computers, personal digital assistants (PDAs), cell phones, or various other network appliances. On an IP network, a node is any device with an IP address.
URL: http://compnetworking.about.com/library/glossary/bldef-node.htm

5) Interactivity:
An interactive site would be one in which some action of the user generates a response either from another human being at the other end of the connection or with a program residing on a computer.
In terms of the Internet activity of web sites, there seem to be several levels or kinds of interactivity.
URL: http://netsim.kib.ki.se/interactivity.cfm