DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   root
      1. <operating system> The Unix superuser 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. <operating system> root directory.
      (1996-11-21)
      3. <data> root node.
      (1998-11-14)