1. The other major versions of the Unixoperating system apart from BSD. Developed by AT&T. Later versions of Unix such as SunOS combined 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. (https://systemv.com/). See also System V Interface Definition. (1994-12-12)