Definitions taken from different dictionaries, with non-IT related definitions removed for relevance.
- A programmer who breaks into computer systems in order to steal or change or destroy information as a form of cyber-terrorism [syn: cyber-terrorist, cyberpunk]
- 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"
- A person who enjoys exploring the details of programmable systems and how to stretch their capabilities, as opposed to most users, who prefer to learn only the minimum necessary.
- One who programs enthusiastically (even obsessively) or who enjoys programming rather than just theorizing about programming.
- A person capable of appreciating hack value.
- A person who is good at programming quickly.
- An expert at a particular program, or one who frequently does work using it or on it; as in `a Unix hacker'. (Definitions 1 through 5 are correlated, and people who fit them congregate.)
- An expert or enthusiast of any kind. One might be an astronomy hacker, for example.
- One who enjoys the intellectual challenge of creatively overcoming or circumventing limitations.
- [deprecated] A malicious meddler who tries to discover sensitive information by poking around. Hence `password hacker', `network hacker'. The correct term for this sense is cracker.