/ əˈdɪʃn; NAmE / noun
1.
[ U ] the process of adding two or more numbers together to find their total :
children learning addition and subtraction
OPP subtraction
2.
[ C ] addition (to sth) a thing that is added to sth else :
the latest addition to our range of cars
an addition to the family (= another child)
( NAmE )
to build a new addition onto a house
3.
[ U ] addition (of sth) the act of adding sth to sth else :
Pasta's basic ingredients are flour and water, sometimes with the addition of eggs or oil.
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IDIOMS
- in addition (to sb/sth)
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WORD ORIGIN
late Middle English : from Latin additio(n-) , from the verb addere , from ad- to + the base of dare put.