Addition Definition

ə-dĭshən
additions
noun
additions
The operation that, for positive integers, consists of increasing by a definite number of increments of 1. The operation is extended to other numbers according to the additive properties of positive integers and other algebraic properties.
American Heritage
An adding of two or more numbers to get a number called the sum.
Webster's New World
Any of certain analogous operations involving mathematical objects other than numbers.
American Heritage
A joining of a thing to another thing.
Webster's New World
The process of adding or joining something to something else, typically to make it larger.
The addition of a porch to the house would increase its resale value.
American Heritage
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other
The act, process, or operation of adding two or more numbers to compute their sum.
American Heritage Science
idiom
in addition
  • Also; as well.
American Heritage
in addition to
  • Over and above; besides.
American Heritage
in addition (to)
  • besides; as well (as)
Webster's New World

Other Word Forms of Addition

Noun

Singular:
addition
Plural:
additions

Idioms, Phrasal Verbs Related to Addition

Origin of Addition

  • Sense of “what is added” dating from 14th Century CE; from Old French adition (“increasement”), from Latin additiōnem, accusative singular of additio.

    From Wiktionary

  • Middle English from Old French from Latin additiō additiōn- from additus past participle of addere to add add

    From American Heritage Dictionary of the English Language, 5th Edition

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