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 users who all have the same set of permissions, or permission level. SharePoint groups can simplify the task of assigning and managing site access. Rather than track site or content access one person at a time, you can use groups to conveniently assign the same permission level to many people at once.