add-on

add-on (dn, -ôn)

n.

1. One thing added as a supplement to another.

2. Computer Science

a. See add-in.

b. A hardware device, such as an expansion card, that is added to a computer to increase its capabilities.

3. An additional amount or charge.

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add-on adj.

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add-on

Noun

a feature that can be added to a standard model to give increased benefits

Thesaurus

Noun	1.	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, improver additive - something added to enhance food or gasoline or paint or medicine afterthought - an addition that was not included in the original plan; "the garage was an afterthought" annex, annexe, wing, extension - an addition that extends a main building attachment - a supplementary part or accessory constituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system" elongation, extension - an addition to the length of something
	2.	add-on - a supplementary component that improves capability accessory, appurtenance, supplement auto accessory - an accessory for an automobile constituent, element, component - an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system" computer accessory - an accessory for a computer; "when you add in all the computer accessories you are going to need the computer gets pretty expensive" fitting - a small and often standardized accessory to a larger system trimmings, fixings - the accessories that normally accompany (something or some activity); "an elaborate formal dinner with all the fixings"; "he bought a Christmas tree and trimmings to decorate it"