Definition of add-on
English to English noun - a component that is added to something to improve it
The addition of a bathroom was a major improvement. The addition of cinnamon improved the flavor.
source: WordNet 3.0 - a supplementary component that improves capability
source: WordNet 3.0
Visual Synonyms 
Nearby Word
add-on, add on, add-in, adown, adonai, addoom, adonean, aton, aden, audition, adman, atony, auden, atone, adana, ad hominem, adnoun, adwana, addeem, attone
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