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Terminology of error-ology

I think a condition should be an event or some exceptional situation
detected in your program.  An error is a condition which when
signalled will be handled by an interactive debugger (error handler)
if no other handler handles it first.  A program can signal a
condition or an error and define its own handlers.  An error always
has at least one handler - the error handler, which invokes an
interactive debugger. 

-- Mary Fontana