add-on Definition in the Cambridge English Dictionary
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Definition of “add-on” - English Dictionary

Definition of "add-on" - British English Dictionary

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add-onnoun [C]

uk   /ˈæd.ɒn/  us   /-ɑːn/
a ​piece of ​equipment that can be ​connected to a ​computer to give it an ​extra use: A ​printer is a ​useful add-on. an ​extrapart that is ​added, ​especially to an ​officiallyorganizedplan, ​system, ​agreement, etc.: Legal ​expensescover is often ​sold as an add-on tohouseholdinsurancepolicies.
(Definition of add-on from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "add on" - Business English Dictionary

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add on

phrasal verb with add uk   us   /æd/ verb [T]
[T] to ​include an ​extra thing or ​amount: When you ​add on the ​amount you have to ​spend to ​earn Air Miles, the ​savings are dubious.
[I] to ​build an ​extrapart on a ​building: Developers want to ​improve the ​site or ​add on.

add-onnoun [C]

uk   us   /ˈædɒn/
something ​extra that is ​added to a ​product to make it better: DVDs often ​includebonus endings and other add-on to sth Many ​companiesofferlegalexpensescover as an add-on to ​homeinsurancepolicies. add-on ​parts/​products/​services
IT a ​piece of ​computerequipment or ​software that is ​added to a ​computer so that the ​computer can do more or different things: an add-on to sth It would ​require an add-on to a ​browser to make it all ​work. add-on ​devices/​features/​software

add-onadjective [only before noun]

uk   us  
extra: add-on costs/fees/charges Car ​dealersprofit from ​questionable add-on ​charges, such as for ​extendedwarranties.
(Definition of add on from the Cambridge Business English Dictionary © Cambridge University Press)
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“add-on” in Business English

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