addition

Addition is the process of bringing two or more numbers or things together. (noun)

Calculating the sum of 25 and 60 is an example of addition.

See addition in Webster's New World College Dictionary

noun

an adding of two or more numbers to get a number called the sum
a joining of a thing to another thing
a thing or part added; increase; specif., a room or rooms added to a building
Law an identifying title or mark of status after a person's name (Ex.: John Smith, Esq.)

See addition in American Heritage Dictionary 4

(ə-dĭshˈən)

noun

The act or process of adding, especially the process of computing with sets of numbers so as to find their sum.
Something added, such as a room or section appended to a building.

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