Meaning of ADDITION in English
n. 1 the act or process of adding or being added. 2 a person or thing added (a useful addition to the team). in addition (often foll. by to) as something added.
[ ME f. OF addition or f. L additio (as ADD) ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012