Definition of "Add" :

noun: a condition (mostly in boys) characterized by behavioral and learning disorders

verb: 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."

verb: make an addition by combining numbers

"Add 27 and 49, please!."

verb: determine the sum of

"Add all the people in this town to those of the neighboring town."

verb: state or say further

verb: bestow a quality on

"The music added a lot to the play."

verb: constitute an addition

"This paper will add to her reputation."