Site Collection
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- A set of Web sites on a Web application that has the same owner and share administration settings. Each site collection contains a top-level Web site and can contain one or more sites (or subsites). There can be multiple site collections on each Web application. A site collection can use only a single content database. Everything is now a site collection: a portal is a site collection where Home is the top-level Web site and the areas are sites (or subsites), a channel hierarchy is a site collection where the root channel is the top-level Web site and sub-channels are sites (or subsites).
Richard Harbridge - Cite This Source - This Definition - Represents a collection of sites in a Web application, including a top-level Web site and all its subsites. A site collection acts as an administrative unit that allows for common security permissions and list templates, content types, and workflows to be shared by multiple sites. The SharePoint object model uses the class SPSite to represent a site collection. Sometimes (for historical reasons) referred to as a site. Properly, however, this is a site collection. For more information, see Server and Site Architecture: Object Model Overview on MSDN.
Microsoft - Cite This Source - This Definition - A set of Web sites on a virtual server 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. There can be multiple site collections on each virtual server.
SharePoint Forum - Cite This Source - This Definition - root web, Site, Subsite, subsites, top-level site, Top-Level Web Site