Meaning of “add-on” in the English Dictionary

(Definition of “add-on” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"add on" in Business English

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add on

phrasal verb with add uk /æd/ us 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 extra part on a building:

Developers want to improve the site or add on.

add-onnoun [ C ]

uk /ˈædɒn/ us

something extra that is added to a product to make it better:

DVDs often include bonus endings and other add-ons.
an add-on to sth Many companies offer legal expenses cover as an add-on to home insurance policies.

IT a piece of computer equipment 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-onadjective [ only before noun ]

uk us

extra:

add-on costs/fees/charges Car dealers profit from questionable add-on charges, such as for extended warranties.

(Definition of “add on” from the Cambridge Business English Dictionary © Cambridge University Press)