add-on

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add-on in WordNet English dictionary

noun

a supplementary component that improves capability
accessory appurtenance supplement add-on
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"
addition add-on improver

WordNet Lexical Database v3.0, © 2006 Princeton University

add-on in English Wiktionary

(noun) Something which can be appended to something else.
(noun) (computing) A software extension that provides additional functions or customization for a core application.

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