The Jargon File

Feature

1) A good, intended property of a program.  

2) A documented bug.  When a program gets unexpected input, and offers...interesting, but technically correct results.

3) "Feature".  A bad, but intended property of a program.  For example, the NSA backdoor in Microsoft Windows.

4) An incidental thing that happens to do something useful as a side effect.  

5) A bug you can't be bothered to fix.
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