An encyclopedia entry. All articles are pages, but not all pages are articles. See Wikipedia:What is an article.
Data dump
To import material from outside sources into Wikipedia without editing, formating and linking. This is frowned upon by most Wikipedians. See Wikify.
Disambiguation
The process of resolving the conflict that occurs when articles about two or more different topics have the same natural title. See Wikipedia:Disambiguation
Edit war
Two or more parties continually making their prefered changes to a page, and undoing the changes they don't agree with. Generally, an edit war is the result of an argument on a talk page that could not be resolved. See Edit wars.
Edit conflict
Two or more parties both attempt to save different edits to the same page. See Wikipedia:edit conflicts.
Running sections or titles of articles through the Google search engine for various purposes. The two most common are to check for copyright violations or to determine which term among several is the most widely used.
A way to classify pages. Wikipedia has namespaces for encyclopedia articles, pages about Wikipedia (Wikipedia:), user pages (User:), special pages (Special:) and talk pages (Talk:, Wikipedia talk:, and User talk:). See Wikipedia:Namespace.
Newbie test(also "newb test" or "noob test")
An edit made by a newcomer to Wikipedia, just to see if "Edit this page" really does what it sounds like. Use Wikipedia:sandbox
NPOV
Neutral point of view, or the agreement to report subjective opinions objectively, so as not to cause edit wars between opposing sides.
A page title which, when requested, merely sends the reader to another page. This is used for synonyms and ease of linking. For example, "impressionist" might redirect to "impressionism". See Wikipedia:Redirect.
A page reserved for discussion. All pages within Wikipedia (except talk pages themselves!) have talk pages attached to them. See wikipedia:talk page
User page
A personal page for Wikipedians. Most people use their pages to introduce themselves and to keep various personal notes and lists. They are also used by Wikipedians to communicate with each other via the user talk pages. A user page has a name of the form [[User:Jimbo Wales]]
Wikify
To format using Wiki markup (as opposed to plain text or HTML) and add internal links to material, incorporating it into the whole of Wikipedia.
Wiki markup
Code like HTML, but simplified and more convenient, for example not <b> and </b>, but in both cases ''', see Wikipedia:How to edit a page.