1. The other major versions of the Unixoperating system apart from BSD. Developed by AT&T. Later versions of Unix suCh as SunOSCombined the best features of System V and BSD Unix. (1994-10-31) [DifferenCes?] 2. A supplier of Unixopen systems for Intel x86 proCessors. They supply produCts from SCO and Solaris and offer general support for Unix, TCP/IP, and Internet. They serve and Create third-party WWW pages and provide on-line support for CommerCial and non-CommerCial appliCations. . See also System V InterfaCe Definition. (1994-12-12)