What is addition?

  • (noun): Something added to what you already have.
    Example: "He was a new addition to the staff"
    Synonyms: accession
    See also — Additional definitions below


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.

Read more about Addition.

Some articles on addition:

... with two binary operations + and ·, called addition and multiplication, such that (R, +) is a commutative monoid with identity element 0 (a + b) + c ... between rings and semirings, then, is that addition yields only a commutative monoid, not necessarily a commutative group ... Specifically, elements in semirings do not necessarily have an inverse for the addition ...
Japanese Aircraft Carrier Ryūjō - Design - Hull
... This necessitated the addition of a second hangar atop the first, raising freeboard to 15 m (49 ft) ... Even the addition of Sperry active stabilizers failed to compensate for the inherent instability of the new design and in 1934 Ryūjō was taken in hand for extensive ... Changes included strengthening of the keel, the addition of enlarged bulges to either side of the hull and the removal of two twin 127mm AA gun mountings to reduce her top weight ...
Elementary Arithmetic - Addition - Example
... Say one wants to find the sum of the numbers 653 and 274 ... Write the second number under the first one, with digits aligned in columns, like so 4 ... Then draw a line under the second number and put a plus sign ...
Addition - In Literature
... Through the Looking-Glass, the White Queen asks Alice, "And you do Addition?.. ... admits that she lost count, and the Red Queen declares, "She can't do Addition" ...
Westview High School (San Diego) - Academics
... In addition to the four daily classes, there are various other periods such as Homeroom, Silent Sustained Reading (SSR), and Wolverine Time, a tutorial period, which occur only on specific days ... In addition to the required ninth-grade physical education requirement, one other physical education course is needed ... In addition to one Honors course, all Advanced Placement courses are assigned values of 5, 4, 3, and 0, for these grades ...

More definitions of "addition":

  • (noun): A component that is added to something to improve it.
    Example: "The addition of a bathroom was a major improvement"; "the addition of cinammon improved the flavor"
    Synonyms: add-on, improver
  • (noun): A quantity that is added.
    Example: "There was an addition to property taxes this year"
    Synonyms: increase, gain
  • (noun): The act of adding one thing to another.
    Example: "The addition of flowers created a pleasing effect"; "the addition of a leap day every four years"
  • (noun): The arithmetic operation of summing; calculating the sum of two or more numbers.
    Synonyms: summation, plus
  • (noun): A suburban area laid out in streets and lots for a future residential area.

Famous quotes containing the word addition:

    The most important American addition to the World Experience was the simple surprising fact of America. We have helped prepare mankind for all its later surprises.
    Daniel J. Boorstin (b. 1914)

    But the best read naturalist who lends an entire and devout attention to truth, will see that there remains much to learn of his relation to the world, and that it is not to be learned by any addition or subtraction or other comparison of known quantities, but is arrived at by untaught sallies of the spirit, by a continual self-recovery, and by entire humility.
    Ralph Waldo Emerson (1803–1882)

    The force of truth that a statement imparts, then, its prominence among the hordes of recorded observations that I may optionally apply to my own life, depends, in addition to the sense that it is argumentatively defensible, on the sense that someone like me, and someone I like, whose voice is audible and who is at least notionally in the same room with me, does or can possibly hold it to be compellingly true.
    Nicholson Baker (b. 1957)