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English definition of “hacker”

hacker

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