Oot: [UNIX] N. 1. The {superuser} Account (with User Name `root') That Ignores Permission Bits, User Number

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:root: [UNIX] n. 1. The {superuser} account (with user name
`root') that ignores permission bits, user number 0 on a UNIX
system. The term {avatar} is also used. 2. The top node of the
system directory structure (home directory of the root user).
3. By extension, the privileged system-maintenance login on any
OS. See {root mode}, {go root}, see also {wheel}.
-- The AI Hackers Dictionary