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English definition of “hacker”

hacker

noun [C] uk   /ˈhæk.ər/ us    //
(also computer hacker) someone who hacks into other people's computer systemsOperating computersMiscellaneous criminals (also phone hacker) someone who hacks into another person's phone and listens to their messages
(Definition of hacker from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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