Etymology
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add-on (n.)

"additional component," 1941, from verbal phrase add on; see add (v.) + on (adv.).

updated on October 10, 2017

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Definitions of add-on from WordNet

add-on (n.)
a software module that extends or enhances the capabilities of an existing application;
Synonyms: plug-in
add-on (n.)
a component that is added to something to improve it;
Synonyms: addition / improver
add-on (n.)
a supplementary component that improves capability;
From wordnet.princeton.edu, not affiliated with etymonline.