addition Meaning in the Cambridge English Dictionary
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Meaning of “addition” in the English Dictionary

"addition" in British English

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additionnoun

uk   us   /əˈdɪʃ.ən/
B2 [U] the ​process of ​addingnumbers or ​amounts together: Twice a ​week the ​children are ​tested in ​basicmathematicalskills such as addition (= ​calculating the ​total of different ​numbers put together) and ​subtraction.in addition (to) B1 as well (as): In addition to his ​apartment in Manhattan, he has a ​villa in Italy and a ​castle in ​Scotland.B2 [C] something that has been ​added to something ​else: A ​secretary would be a ​welcome/​useful addition toourstaff.humorous I ​hear you're ​expecting a ​small addition to the ​family (= you are going to have a ​baby)! [C] the ​act of ​adding a ​substance or thing to something ​else: Most ​workingenvironments are ​improved by the addition of (= by ​adding) a few ​plants and ​pictures. [C] US (UK extension) a new ​partadded to a ​house or other ​building: We're ​building an addition toourhouse.
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(Definition of addition from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"addition" in American English

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additionnoun

 us   /əˈdɪʃ·ən/

addition noun (CALCULATION)

mathematics [U] the ​process of ​calculating the ​total of a ​group of ​numbers: [U] We ​learn addition and ​subtraction in first and second ​grade.

addition noun (INCREASE)

[C/U] the ​joining of something to something ​else to make it ​larger or more ​important, or the ​person or thing that ​joins something: [C] Harold is the ​newest addition to ​ourstaff.
(Definition of addition from the Cambridge Academic Content Dictionary © Cambridge University Press)

"addition" in Business English

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additionnoun

uk   us   /əˈdɪʃən/
[C] something ​extra that is ​added to something: an addition to sth The ​companyprovides a ​compensationpackage which ​amounts to an addition to the employee's ​salary.
[U] the ​act of ​adding something to something else: the addition of sth to sth The addition of women to the ​board was a deliberate ​diversitystrategy.
[C] US ( UK extension) a new ​partadded to a ​building: an addition to/on sth The ​commissionersplan to ​build an addition on the ​front of the ​building.
in addition to sth used for saying that something else exists or is ​included: In addition to movies, the ​company also ​publishedmagazines.
(Definition of addition from the Cambridge Business English Dictionary © Cambridge University Press)
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“addition” in Business English

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