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superuser

noun [C]
 
 
/ˈsuː.pə.juː.zər/ US  /-pɚ.juː.zɚ/

Definition

someone who knows a lot about a computer program and can help other people to use itExperts and specialistsOperating computers
(Definition of superuser noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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