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add-on

[ad-on, -awn] /ˈædˌɒn, -ˌɔn/
noun
1.
a device or unit added to equipment or a construction:
an add-on to a computer; a nice add-on to an old house.
2.
an extra charge:
Add-ons for taxes and tour guide fees boosted the price of the vacation to $2,500.
3.
an additional item, as a rider or provision:
This is just another legislative add-on.
4.
anything added on:
a hi-fi system that can be augmented with add-ons like extra speakers.
adjective
5.
being installed or provided as an add-on:
an add-on speaker system.
Origin
1945-1950
1945-50; noun and adj. use of verb phrase add on
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for add on

add-on

noun
1.
a feature that can be added to a standard model or package to give increased benefits
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for add on

add-on

n.

"additional component," 1941, from add (v.) + on.

Online Etymology Dictionary, © 2010 Douglas Harper
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5
5
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