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- (computing) A computer operating system that shares the original source code by Dennis Ritchie and Ken Thompson, currently owned by Novell.
- (computing) An operating system largely compatible with Unix that qualifies for use of the UNIX trademark, currently owned by The Open Group.
- Synonym: UNIX
- (computing, informal) The above plus Unix-like operating systems similar to Unix but not qualifying for use of the UNIX trademark.
- (computing) The group of Unix operating systems as a whole.
- Synonym: unix
- The Linux kernel operating system is one of the most popular forms of Unix.