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root n.
[Unix] 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; 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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