make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of; "We added two students to that dorm room"; "She added a personal note to her letter"; "Add insult to injury"; "Add some extra plates to the dinner table"
make an addition by combining numbers; "Add 27 and 49, please!"
determine the sum of; "Add all the people in this town to those of the neighboring town"
state or say further; "`It doesn't matter,' he supplied"
bestow a quality on; "Her presence lends a certain cachet to the company"; "The music added a lot to the play"; "She brings a special atmosphere to our meetings"; "This adds a light note to the program"
constitute an addition; "This paper will add to her reputation"
a condition (mostly in boys) characterized by behavioral and learning disorders