Definition: The Debian project maintains a version number that is slightly different each time the Debian distribution is updated, starting from "6.4". This version number represents the date of the latest release in the current month, which is used to compile packages for use with other distributions like Ubuntu and CentOS. In context, "debian_6.0" is a specific version, not part of a broader list of Debian versions. It refers to an exact release date that is typically associated with one or more major releases of the Debian operating system. The term "6.4" indicates that it's from the "release 6.4", which was the last major release before the current current major version, "7.1".