Definition of "superuser" [superuser]

• A user with complete access to the operating system and its configuration. (noun)

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• "In the end this highlights a significant new IT security need that analyst groups are calling "superuser privilege management.""
• "The root account is also called the superuser; it is a login that bypasses all security protection on your system."
• "To do so, you have to have greater powers than a normal user; you must become the root user (also called the superuser)."