WSS Glossary

Recently, I work on learning another Microsoft product called Windows Sharepoint Services 3.0.
One difficulty is that there are many new terms that I need to understand.
Below I list some of the terms that I think I need to understand the clear definition. I will add when new term is found.
Site A group of related Web pages in Windows SharePoint Services where users can share data in lists and libraries, and can view and edit one or more Web part pages. Sites are generally used for collaboration, but can also be used to host content.
Site collection A set of Web sites that have the same owner and share administration settings. Each site collection contains a top-level Web site and can contain one or more subsites.
Site definition A directory on the front-end Web server containing the .xml files and .aspx page templates that define a blueprint for the site.
Site template A file that includes a set of .xml files that contain the manifests and configuration parameters that modify a site definition.
Site template gallery A collection of site templates.
Web part A modular unit of information that consists of a title bar, a frame, and content. Web parts are the basic building blocks of a Web part page.
Web part page A Web page that can host one or more Web parts. A Web part page usually contains one or more zones to allow Web parts to be manipulated on the page.