hacker hack‧er [ˈhækə ǁ -ər] noun [countable]
COMPUTING someone who secretly reaches information on someone else's computer system so that they can look at, use, or change it:
• Intercepting messages on the Internet is easy for a smart hacker.
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hacker UK US /ˈhækər/ noun [C] IT
► 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
Financial and business terms. 2012.