1. The other major versions of the Unixoperating sYstem apart from BSD. Developed bYAT&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-partYWWW pages and provide on-line support for commercial and non-commercial applications. . See also SYstem V Interface Definition. (1994-12-12)