root
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root: n.

  1. [Unix] 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; historically the home directory of the root user, but probably named after the root of an (inverted) tree.

  3. By extension, the privileged system-maintenance login on any OS. See root mode, go root, see also wheel.

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