Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “hacker”

hacker

noun [C]
 
 
/ˈhækər/ 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
(Definition of hacker from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of hacker?
Add Cambridge dictionaries to your browser to your website

Definitions of “hacker” in other dictionaries

Word of the Day

maiden

a girl or young woman

Word of the Day

Countability – grammar codes

by Dom Glennon​​,
November 26, 2014
Advices and informations Have you ever noticed strange codes in square brackets on entries in Cambridge Dictionaries Online and wondered what they mean? These are grammar codes, giving you a brief summary of how that word behaves grammatically. More information can be obtained by hovering your cursor over the code, and there’s

Read More 

ped-text verb

November 24, 2014
to text someone while walking I’m ped-texting, I’m looking down at my phone, 75 percent of the time.

Read More