What is the meaning of add?

noun

• A condition (mostly in boys) characterized by behavioral and learning disorders.
  • synonyms: attention deficit disorder, attention deficit hyperactivity disorder, ADHD, hyperkinetic syndrome, minimal brain dysfunction, minimal brain damage, MBD

verb

• Make an addition (to); join or combine or unite with others; increase the quality, quantity, size or scope of.
  • usage: "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"
• State or say further.
  • usage: "`It doesn't matter,' he supplied"
  • synonyms: append, supply
• Bestow a quality on.
  • usage: "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"
  • synonyms: lend, impart, bestow, contribute, bring
• Make an addition by combining numbers.
  • usage: "Add 27 and 49, please"
  • synonyms: add together
• Determine the sum of.
  • usage: "Add all the people in this town to those of the neighboring town"
  • synonyms: total, tot, tot up, sum, sum up, summate, tote up, add together, tally, add up
• Constitute an addition.
  • usage: "This paper will add to her reputation"