Subluxation: Partial dislocation of a joint. A complete dislocation is a luxation.
The largest number of items per content database that has been tested on SharePoint Server 2013 is 60 million items, including documents and list items. If you plan to store more than 60 million items in SharePoint Server 2013, you must deploy multiple content databases.
A SharePoint group is a collection of SharePoint users. Typically, the people in a SharePoint group all do similar kinds of tasks on a site and need the same permission level. You can organize users into any number of groups, depending on the size and complexity of your organization or website.