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added value
addend
addendum
adder (1)
adder (2)
adder’s tongue
addict
addicted
addiction
addictionology
addictive
addictive personality
adding machine
Addis Ababa
Addison
Addison’s disease
addition
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add-on
add-on (plural add-ons) or add-in (plural add-ins)


noun 
Definition:
 
extra equipment: a piece of computer equipment added to another to expand its capabilities
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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