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\fBhacker\fP [originally, someone who makes furniture with an axe], noun.
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1. A person who enjoys learning the details of programming systems and
how to stretch their capabilities, as opposed to most users who
prefer to learn only the minimum necessary.
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2. One who programs enthusiastically, or who enjoys programming rather than just
theorizing about programming.
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3. A person capable of appreciating hack value (q.v.).
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4. A person who is good at programming quickly.
Not everything a hacker produces is a hack.
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5. An expert at a particular program, or one who frequently does work using it or on
it; example: ``A LISP hacker''.
(Definitions 1 to 5 are correlated, and people who fit them congregate.)
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6. A malicious or inquisitive
meddler who tries to discover information by poking around.
Hence ``password hacker'', ``network hacker''.