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English definition of “hacker”

hacker

noun [C]     /ˈhækər/
COMPUTER someone who illegally gets into someone else's computer system: The hacker obtained names and e-mail accounts of the company's one million customers.Computer programming and softwareMiscellaneous criminals
TELEPHONE someone who illegally and secretly listens to someone else's telephone conversations and telephone messages: The mobile phone hackers face five years in jail. Miscellaneous criminals
(Definition of hacker noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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