Definition of “addition” - English Dictionary

“addition” in British English

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uk /əˈdɪʃ.ən/ us /əˈdɪʃ.ən/

B2 [ U ] the process of adding numbers or amounts together:

Twice a week the children are tested in basic mathematical skills 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 to our staff.
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 working environments are improved by the addition of (= by adding) a few plants and pictures.

[ C ] US UK extension a new part added to a house or other building:

We're building an addition to our house.

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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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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 our staff.

(Definition of “addition” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“addition” in Business English

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uk /əˈdɪʃən/ us

[ C ] something extra that is added to something:

an addition to sth The company provides a compensation package 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 diversity strategy.

[ C ] US UK extension a new part added to a building:

an addition to/on sth The commissioners plan 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 published magazines.

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