addition

noun

ad·​di·​tion ə-ˈdi-shən 

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.

Synonyms

• annex
• extension
• penthouse

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

In his time in the Senate, Simpson has served as chair of the Ethics and Campaign Finance Committee and of the Baldwin County Legislative Delegation, in addition to membership on other committees. —Margaret Kates | [e-mail], al, 11 Sep. 2023

The product introduction begins at 10 a.m. PT — which is also expected to give consumers a first look at new Apple Watches, Airpods and other gear, in addition to the phones. —Skyler Caruso, Peoplemag, 11 Sep. 2023

In addition to restoring seagrass beds and kelp forests, otters would draw enthusiasts to towns up the coast. —Dino Grandoni and Melina Mara, Anchorage Daily News, 11 Sep. 2023

In addition to negligence, the complaint alleges that the child’s Fourth Amendment rights were violated. —Praveena Somasundaram, Washington Post, 11 Sep. 2023

In addition to his domestic economic troubles, China’s relations with India are at a hostile low point. —Courtney Subramanian, Los Angeles Times, 11 Sep. 2023

In addition to metro Detroit, the most expensive gas price averages are in Marquette at $3.77 a gallon, and Traverse City, at $3.72. —Frank Witsil, Detroit Free Press, 11 Sep. 2023

In addition to the songs, Stevens assembled a 48-page Javelin companion book of art collages and 10 essays. —Madison Bloom, Pitchfork, 11 Sep. 2023

In addition to supplementation, diet and lifestyle practices are essential for a strong immune system. —Hilary Tetenbaum, USA TODAY, 31 Aug. 2023

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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

Phrases Containing addition

• in addition
• in addition to

• in addition
• in addition to

Kids Definition

addition

noun

ad·​di·​tion ə-ˈdish-ən 

a-

1

: the result of adding : increase

2

: the act, process, or operation of adding

3

: a part added (as to a building)