Meaning of ADDITION in English
/ əˈdɪʃn; NAmE / noun
[ U ] the process of adding two or more numbers together to find their total :
children learning addition and subtraction
[ 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
[ 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.
- in addition (to sb/sth)
late Middle English : from Latin additio(n-) , from the verb addere , from ad- to + the base of dare put.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005