Definitions for "OS X"
Keywords:  macintosh, latest, apple, ess, bsd
The Macintosh operating system introduced in 2002, OS X was significantly different from the previous operating system (OS 9). OS 9 applications can only run under a special mode of OS X. Several updated versions of OS X are available, usually referred to as decimals of 10 (10.1, 10.35).
Macintosh Operating System X is the most recent Mac OS, originally released in 2001, but re-released since.
OS X (oh-ess-ten) is the most recent operating system produced by Apple for Macintosh computers.