From WordNet (r) 3.0 (2006) :
hacker
n 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 [syn: hacker, 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 [syn: hack, drudge,
hacker]