add-on


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add-on

a feature that can be added to a standard model or package to give increased benefits
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

add-on

[′ad‚ȯn]
(computer science)
A peripheral device, such as a printer or disk drive, that is added to a basic computer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
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References in periodicals archive ?
The issues don't fully pull your focus from the add-on's main strengths, however.
* Availability alone or with +1.5, +2.0 and +2.5- range clip-on magnifiers, which is also available separately as an add-on accessory.