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A substantial increase in the capabilities of hardware or software.
An increase in the density of charged carriers in a particular region of a semiconductor.
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.