hacker

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hacker
1. A person who attempts to breach the security of a computer system by access from a remote point, especially by guessing or otherwise obtaining a password. The motive may be merely personal satisfaction, for example by endeavoring to access a system in another country, but it may occasionally have a sinister intent.

2. Originally, a person who had an instinctive knowledge enabling him or her to develop software apparently by trial and error.

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