add on

add-on

[ad-on, -awn]
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:
1945–50; 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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Collins
World English Dictionary
add-on
 
n
a feature that can be added to a standard model or package to give increased benefits

Collins English Dictionary - Complete & Unabridged 10th Edition
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