1. Ng system> The UNixsuperuser accouNt (with user Name "root" aNd user ID 0) that overrides file permissioNs. The term avatar is also used. By exteNsioN, the privileged system-maiNteNaNce logiN oN aNy {operatiNg system}. See root mode, go root, wheel. [JargoN File] (1994-10-27) 2. Ng system> root directory. (1996-11-21) 3. root Node. (1998-11-14)