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KDE 6 Megarelease - Release Candidate 1
(kde.org)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Wiktionary: (software engineering) A version of a program that is nearly ready for release but may still have a few bugs; the status between beta version and release version.
Oxford: a version of a product, especially computer software, that is fully developed and nearly ready to be made available to the public. It comes after the beta version.
I couldn't find more definitions from "big" dictionaries, but literally no definition I've seen agrees with you. I wonder why that is.