superusern.
/ˈsuːpəjuːzə/, /ˈsjuːpəjuːzə/, U.S. /ˈsupərˌjuzər/ Computing.
A person having full and unrestricted access to all parts of a system; a user account with such access, typically intended for use only by a system administrator. Cf. root n.1 18b.
ΚΠ
1971 K. Thompson & D. M. Ritchie Unix Programmer's Man. 3 Nov. §13.7 in cm.bell-labs.com (O.E.D. Archive) Only the super-user may invoke this command.
1985 InfoWorld 11 Mar. 6/2 Every system needs an administrator, or ‘super user’, who can do what he wants so that he can do what he must should a problem arise.
1991 K. Hafner & J. Markoff Cyberpunk ii. 187 The program had been installed to run with superuser privileges.
2002 J. Peek et al. Learning UNIX Operating Syst. (ed. 6) i. 6 A prompt that ends with a hash mark (#) usually means that you're logged in as the superuser.
2010 Australian (Nexis) 26 Oct. 36 This process gives you root or superuser access to the inner workings of your phone's operating system.
This is a new entry (OED Third Edition, June 2012; most recently modified version published online March 2022).
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n.1971