Source : Webster's Revised Unabridged Dictionary (1913)

Enhancement \En*hance"ment\, n.
   The act of increasing, or state of being increased;
   augmentation; aggravation; as, the enhancement of value,
   price, enjoyments, crime.

Source : WordNet®

enhancement
     n : an improvement that makes something more agreeable [syn: {sweetening}]

Source : Free On-Line Dictionary of Computing

enhancement
     
        1. A change to a product which is intended to make it better
        in some way, e.g. new functions, faster, or occasionally more
        compatible with other systems.  Enhancements to {hardware}
        components, especially {integrated circuits} often mean they
        are smaller and less demanding of resources.  Sadly, this is
        almost never true of {software} enhancements.
     
        2. {Marketroid}-speak for a {bug fix}.  This abuse of language
        is a popular and time-tested way to turn incompetence into
        increased revenue.  A hacker being ironic would instead call
        the fix a {feature}, or perhaps save some effort by declaring
        "{That's not a bug, that's a feature!}".
     
        [{Jargon File}]
     
        (1998-04-04)