Meaning of ADD in English

ADD

v.tr.

1. join (one thing to another) as an increase or supplement (add your efforts to mine; add insult to injury).

2 put together (two or more numbers) to find a number denoting their combined value.

3 say in addition (added a remark; added that I was wrong).

Phrases and idioms:

add in include. add-on something added to an existing object or quantity. add to increase; be a further item among (this adds to our difficulties). add up

1. find the total of.

2 (foll. by to) amount to; constitute (adds up to a disaster).

3 colloq. make sense; be understandable.

Derivatives:

added adj.

Etymology: ME f. L addere (as AD-, dare put)

Oxford English vocab.      Оксфордский английский словарь.