Add-on (Noun)
Meaning 1
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".
Classification
Nouns denoting man-made objects.
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Meaning 2
A supplementary component that improves capability.
Classification
Nouns denoting man-made objects.
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Meaning 3
A software module that extends or enhances the capabilities of an existing application.
Classification
Nouns denoting communicative processes and contents.