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 followed by up): Add this column of figures.Add up the grocery bills.
3. to say or write further.
4. to include (usually followed 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 followed by to): His illness added to the family's troubles.

7. copy added to a completed story.

8. to signify; indicate: The evidence adds up to a case of murder.

9. add up,
• to make the desired, expected, or correct total: These figures don't add up right.
• to seem reasonable or consistent; be in harmony or accord: Some aspects of the story didn't add up.

1. the inattentive subtype of ADHD, usually marked by distractibility and difficulties with executive function.

1. to combine (two or more numbers or quantities) by addition
2. to increase (a number or quantity) by another number or quantity using addition
3. to join (something) to something else in order to increase the size, quantity, effect, or scope; unite (with)
4. to have an extra and increased effect (on)
5. to say or write further
6. to include

7. an instance of adding someone to one's list of contacts on a social networking site, esp MySpace

1. attention deficit disorder

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