addition

noun

ad·​di·​tion ə-ˈdi-shən How to pronounce addition (audio)
a-
1
: a part added (as to a building or residential section)
The addition expanded the kitchen.
2
: anything or anyone added : increase
The clerk was a recent addition to the staff.
3
: the act or process of adding
a recipe enhanced by the addition of freshly ground pepper
especially : the operation of combining numbers so as to obtain an equivalent simple quantity
schoolchildren learning about addition and subtraction
4
: direct chemical combination of substances into a single product
Phrases
in addition
: besides entry 2, also
The job requires a college degree and, in addition, at least two years of experience.
in addition to
: combined or associated with : besides entry 1 sense 2
In addition to soup, several salads were served.

Examples of addition in a Sentence

The children learned addition and subtraction. The museum's collection includes several new additions.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In addition, 2023 and 2024 featured a powerful El Niño, which tends to strengthen westerly winds in the Atlantic, making early development less likely. Jim Foerster, Forbes.com, 2 June 2025 In addition to cost savings and a reduced carbon footprint, the Park District shares in expanding access to clean energy, improving grid resilience and creating jobs in the renewable energy industry, according to a May press release from E4. Steve Sadin, Chicago Tribune, 2 June 2025 In addition, Hallmark Media named Jessica Tasler Noble chief culture officer, moving over from Hallmark Product & Retail, and succeeding Sabrina Wiewel, who will now serve as executive VP of Crayola Studios. Alex Weprin, HollywoodReporter, 2 June 2025 In addition, Dean has announced a surprise underplay at London’s Shepherd’s Bush Empire on June 11 with tickets available to those who pre–order the album. Thomas Smith, Billboard, 2 June 2025 See All Example Sentences for addition

Word History

Etymology

Middle English addicioun, borrowed from Anglo-French addicion, borrowed from Latin additiōn-, additiō, from addi-, variant stem of addere "to add" + -tiōn-, -tiō, suffix of action nouns

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of addition was in the 14th century

Browse Nearby Words

Cite this Entry

“Addition.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/addition. Accessed 5 Jun. 2025.

Kids Definition

addition

noun
ad·​di·​tion ə-ˈdish-ən How to pronounce addition (audio)
a-
1
: the result of adding : increase
2
: the act, process, or operation of adding
3
: a part added (as to a building)

More from Merriam-Webster on addition

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