1. The other major versions of the unix operating 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.

2. A supplier of unix open 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.