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add on
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Nounadd on has 2 senses
addition, add-on, improver - a component that is added to something to improve it; "the addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor" --1is a kind ofcomponent, constituent, element --1has particulars:
append, add on, supplement, affix - add to the very end; "He appended a glossary to his novel where he used an invented language" --2is one way toattach