[ad-on, -awn]
a device or unit added to equipment or a construction: an add-on to a computer; a nice add-on to an old house.
an extra charge: Add-ons for taxes and tour guide fees boosted the price of the vacation to $2,500.
an additional item, as a rider or provision: This is just another legislative add-on.
anything added on: a hi-fi system that can be augmented with add-ons like extra speakers.
being installed or provided as an add-on: an add-on speaker system.

1945–50; noun and adj. use of verb phrase add on Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
a feature that can be added to a standard model or package to give increased benefits

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
None of the add-on image programs zoom as well, they all stop at the pixel
  block level.
The first order of business is to figure out if there is some add-on to the
  hypothesis that can explain this water.
But because it is sold as an add-on, other channels are in effect increasing
  its price.
The mortgage rates do not include add-on fees known as points.
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