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add on in WordNet English dictionary
verb- make an addition
"Let's add on to this"
add on
- add to the very end
"He appended a glossary to his novel where he used an invented language"
append add on supplement affix
WordNet Lexical Database v3.0, © 2006 Princeton University
add on in English Wiktionary
- (noun) An extension or accessory; an extra service that can be added to the basic.
Wiktionary, GNU Free Documentation Licence