|(programming)||major release - A release of a piece of software which is not
merely a revision or a bug fix release but which contains
substantial changes (e.g., an overhaul of the interface,
change in compatibility).|
Traditionally, major releases are numbered as X.0; for example, WordPerfect 6.0 is a major release, significantly different from any previous version; whereas WordPerfect 6.1 has only minor changes, and is, thus, only a revision.
See also major delivery.