| 1. | to unite or join so as to increase the number, quantity, size, or importance: to add two cups of sugar; to add a postscript to her letter; to add insult to injury. |
| 2. | to find the sum of (often fol. by up): Add this column of figures. Add up the grocery bills. |
| 3. | to say or write further. |
| 4. | to include (usually fol. by in): Don't forget to add in the tip. |
| 5. | to perform the arithmetic operation of addition: children learning to add and subtract. |
| 6. | to be or serve as an addition (usually fol. by to): His illness added to the family's troubles. |
| 7. | Journalism. copy added to a completed story. |
| 8. | add up to, to signify; indicate: The evidence adds up to a case of murder. |
| 9. | add up,
|
ADD abbr.
attention deficit disorder
| ADD
Abbreviation of attention deficit disorder |
add up to
Amount to, signify, as in The smooth airline connections, luxury hotel, and fine weather added up to the best vacation we'd ever had. [Early 1900s] Also see add up.