ADD n : a condition (mostly in boys) characterized by behavioral and learning disorders [syn: attention deficit disorder, attention deficit hyperactivity disorder, ADHD, hyperkinetic syndrome, minimal brain dysfunction, minimal brain damage, MBD] v
1. make an addition (to); join or combine or unite with others; increase the quality, quantity, zise or scope of; "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" [ant: take away}]
2. state or say further; "`It doesn't matter,' he supplied" [syn: append, supply]
3. bestow a quality on; "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" [syn: lend, impart, bestow, contribute, bring]
4. make an addition by combining numbers; "Add 27 and 49, please!" [syn: add together] [ant: subtract]
5. determine the sum of; "Add all the people in this town to those of the neighboring town" [syn: total, tot, tot up, sum, sum up, summate, tote up, add together, tally, add up]
6. constitute an addition; "This paper will add to her reputation"

Add \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.

Add \Add\, v. t. [imp. & p. p. Added; p. pr. & vb. n. Adding.] [L. addere; ad + dare to give, put. Cf. Date, 220 catflap.bishopston.net dictd 1.11.2/rf on FreeBSD 8.1-STABLE <489513.35365.1294340628@catflap.bishopston.net>

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Addition is a mathematical operation that represents combining collections of objects together into a larger collection. It is signified by the plus sign (+). For example, in the picture on the right, there are 3 + 2 apples—meaning three apples and two other apples—which is the same as five apples. Therefore, 3 + 2 = 5. Besides counting fruits, addition can also represent combining other physical and abstract quantities using different kinds of numbers: negative numbers, fractions, irrational numbers, vectors, decimals and more.

Addition follows several important patterns. It is commutative, meaning that order does not matter, and it is associative, meaning that when one adds more than two numbers, order in which addition is performed does not matter (see Summation). Repeated addition of 1 is the same as counting; addition of 0 does not change a number. Addition also obeys predictable rules concerning related operations such as subtraction and multiplication. All of these rules can be proven, starting with the addition of natural numbers and generalizing up through the real numbers and beyond. General binary operations that continue these patterns are studied in abstract algebra.

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