Definition of 'hacker'

Noun

1. someone who plays golf poorly
2. a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism
      Synonyms: cyber-terrorist cyberpunk
3. a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm; "true hackers subscribe to a code of ethics and look down upon crackers"
4. one who works hard at boring tasks
      Synonyms: hack drudge

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