ADD-ON

• (noun) a supplementary component that improves capability

  synonyms : accessory , appurtenance , supplement

  I think a good lens cover is a neccessary accessory for that camera. -added by geeta_inlas

• (noun) 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"

  synonyms : addition , improver

WordNet® 3.0, © 2006 by Princeton University.

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