1. [n]  a condition (mostly in boys) characterized by behavioral and learning disorders
2. [v]  make an addition (to); join with others; increase by another or several; "We added two students to that dorm room"; "She added a personal note to her letter"; "Add insult to injury"
3. [v]  make an addition by combining numbers; "Add 27 and 49, please!"
4. [v]  determine the sum of; "Add all the people in this town to those of the neighboring town"
5. [v]  state or say further; "`It doesn't matter,' he supplied"
6. [v]  of a quality, as in; "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"
7. [v]  constitute an addition; "This paper will add to her reputation"

ADD is a 3 letter word that starts with A.

1. \Add\, v. t. [imp. & p. p. {Added}; p. pr. & vb. n.
   {Adding}.] [L. addere; ad + dare to give, put. Cf. {Date},
   {Do}.]
   1. To give by way of increased possession (to any one); to
      bestow (on).
            The Lord shall add to me another son. --Gen. xxx.
                                                  24.
   2. To join or unite, as one thing to another, or as several
      particulars, so as to increase the number, augment the
      quantity, enlarge the magnitude, or so as to form into one
      aggregate. Hence: To sum up; to put together mentally; as,
      to add numbers; to add up a column.
            Back to thy punishment, False fugitive, and to thy
            speed add wings.                      --Milton.
            As easily as he can add together the ideas of two
            days or two years.                    --Locke.
   3. To append, as a statement; to say further.
            He added that he would willingly consent to the
            entire abolition of the tax.          --Macaulay.
   Syn: {To Add}, {Join}, {Annex}, {Unite}, {Coalesce}.
   Usage: We {add} by bringing things together so as to form a
          whole. We {join} by putting one thing to another in
          close or continuos connection. We {annex} by attaching
          some adjunct to a larger body. We {unite} by bringing
          things together so that their parts adhere or
          intermingle. Things {coalesce} by coming together or
          mingling so as to form one organization. To {add}
          quantities; to join houses; to {annex} territory; to
          {unite} kingdoms; to make parties {coalesce}.
   

2. \Add\, v. i.
   1. To make an addition. To add to, to augment; to increase;
      as, it adds to our anxiety. ``I will add to your yoke.''
      --1 Kings xii. 14.
   2. To perform the arithmetical operation of addition; as, he
      adds rapidly.