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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 addon

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 addon

add-on

n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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addon in the Bible

low, one of the persons named in Neh. 7:61 who could not "shew their father's house" on the return from captivity. This, with similar instances (ver. 63), indicates the importance the Jews attached to their genealogies.

Easton's 1897 Bible Dictionary
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