hacker
/ˈhækər/ noun [C] ITDefinition
› someone who illegally uses a computer to access information stored on another computer system or to spread a computer virus: The software company said that more than 30,000 computers were hijacked by hackers each day and used to illegally send out spam. Installing a firewall is one method of trying to protect against hackers. Hacker attacks, financial fraud, and data theft are now everyday concerns. a computer/internet hacker a criminal/malicious hacker
(Definition of hacker noun from the Cambridge Business English Dictionary
© Cambridge University Press)
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