1. The other major verSionS of the Unixoperating SyStem apart from BSD. Developed by AT&T. Later verSionS of Unix Such aSSunOS 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. . See alSo SyStem V Interface Definition. (1994-12-12)