1. (noun) addition, add-on, improver
a component that is added to something to improve it
Synonyms: add-on, improver, summation, appurtenance, increase, supplement, humanitarian, addition, accession, accessory, do-gooder, plus, gain
2. (verb) accessory, appurtenance, supplement, add-on
a supplementary component that improves capability
Synonyms: add-on, gear, accouterment, accessary, accoutrement, addendum, improver, addition, appurtenance, accessory, paraphernalia, postscript, supplement, supplementation
3. (verb) add on
make an addition
Synonyms: append, supplement, affix, add on
4. (verb) append, add on, supplement, affix
add to the very end
Synonyms: append, hang on, tag on, stick on, add on, add, affix, tack, supply, tack on, supplement
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Synonyms for add on 
