hacker in WordNet English dictionary

1. a programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism
   hacker  cyber-terrorist  cyberpunk 
   
2. one who works hard at boring tasks
   hack  drudge  hacker 
   
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"
   hacker 
   
4. someone who plays golf poorly
   hacker