Meaning of ADD in English
[add] vb [ME, fr. L addere, fr. ad- + -dere to put--more at do] vt (14c) 1: to join or unite so as to bring about an increase or improvement "~s 60 acres to his land" "wine ~s a creative touch to cooking"
2: to say further: append
3: to combine (numbers) into an equivalent simple quantity or number
4: to include as a member of a group "don't forget to ~ me in" ~ vi 1 a: to perform addition b: to come together or unite by addition
2. a: to serve as an addition "the movie will ~ to his fame" b: to make an addition "~ed to her savings" -- add.able or add.ible adj
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012