Addition

Addition (often signified by the plus symbol “+”) is one of the four basic operations of arithmetic; the others are subtraction, multiplication and division. The addition of two whole numbers is the total amount of those values combined. For example, in the adjacent picture, there is a combination of three apples and two apples together, making a total of five apples. This observation is equivalent to the mathematical expression “3 + 2 = 5” i.e., “3 add 2 is equal to 5”.

Besides counting items, addition can also be defined on other types of numbers, such as integers, real numbers and complex numbers. This is part of arithmetic, a branch of mathematics. In algebra, another area of mathematics, addition can be performed on abstract objects such as vectors and matrices.

Addition has several important properties. It is commutative, meaning that order does not matter, and it is associative, meaning that when one adds more than two numbers, the 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.

Performing addition is one of the simplest numerical tasks. Addition of very small numbers is accessible to toddlers; the most basic task, 1 + 1, can be performed by infants as young as five months and even some members of other animal species. In primary education, students are taught to add numbers in the decimal system, starting with single digits and progressively tackling more difficult problems. Mechanical aids range from the ancient abacus to the modern computer, where research on the most efficient implementations of addition continues to this day.

**Wikipedia**

Addition (noun)

The act of adding anything.

“The addition of five more items to the agenda will make the meeting unbearably long.”

Addition (noun)

Anything that is added.

Addition (noun)

The arithmetic operation of adding.

Addition (noun)

A dot at the right side of a note as an indication that its sound is to be lengthened one half.

Addition (noun)

A title annexed to a person’s name to identify him or her more precisely, as in “John Doe, Esq.”, “Robert Dale, Mason”, “Thomas Way, of New York”.

Addition (noun)

Something added to a coat of arms, as a mark of honour; opposed to abatement.

Supplement (noun)

Something added, especially to make up for a deficiency.

Supplement (noun)

An extension to a document or publication that adds information, corrects errors or brings up to date.

Supplement (noun)

An additional section of a newspaper devoted to a specific subject.

Supplement (noun)

An angle that, when added to a given angle, makes 180°; a supplementary angle.

Supplement (noun)

A deficiencies or enhance muscular development.

Supplement (verb)

To provide or make a supplement to something.

**Wiktionary**

Addition (noun)

the action or process of adding something to something else

“the hotel has been extended with the addition of more rooms”

Addition (noun)

a person or thing added or joined

“you will find the coat a useful addition to your wardrobe”

Addition (noun)

the process of calculating the total of two or more numbers or amounts

“she began with simple arithmetic, addition and then subtraction”

Addition (noun)

the process of combining matrices, vectors, or other quantities under specific rules to obtain their sum or resultant

“the concepts of vectors and vector addition”

**Oxford Dictionary**