add-on
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add-on
a feature that can be added to a standard model or package to give increased benefits
add-on
[′ad‚ȯn] (computer science)
A peripheral device, such as a printer or disk drive, that is added to a basic computer.
add-on
(1) Software that adds functionality to an existing application. See plug-in.(2) Hardware that is installed into an existing system. See add-in.