Adjacent Words

add-on definitions

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WordNet (r) 3.0 (2005)

n
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" [syn: addition, add-on, improver]
2: a supplementary component that improves capability [syn: accessory, appurtenance, supplement, add-on]

Merriam Webster's

I. noun Date: 1946 something added on: as a. a sum or amount added on b. something (as an accessory or added feature) that enhances the thing it is added to <computer hardware add-ons> II. adjective Date: 1955 1. being or able to be added on <an add-on device> 2. able to be added to <add-on certificates of deposit>

Collin's Cobuild Dictionary

(add-ons) An add-on is an extra piece of equipment, especially computer equipment, that can be added to a larger one which you already own in order to improve its performance or its usefulness. Speakers are sold as add-ons for personal stereos... N-COUNT: oft N n