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addendum
adder (1)
adder (2)
adder’s tongue
addict
addicted
addiction
addictionology
addictive
addictive personality
adding machine
Addis Ababa
Addison
Addison’s disease
addition
additional
additional hedge
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add-on service
add-on serv·ice (plural add-on ser·vic·es)


noun 
Definition:
 
service added to existing one: an additional service that a business offers, sometimes at extra cost, in conjunction with another existing service
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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