Meaning of ADDITION in English

ADDITION

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.