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 addition to Mayorkas, the Department of Homeland Security, ICE and several detention facilities are named as defendants in the lawsuit. —Louis Casiano, Fox News, 24 Oct. 2024

In addition to isolated catalysts like the McDonald’s foodborne illness agita and an analyst report pointing to lighter-than-hoped sales for Apple’s iPhone 16, there was a familiar foe behind much of the losses: climbing Treasury yields. —Derek Saul, Forbes, 23 Oct. 2024

In addition to providing long-term benefits, the formula instantly revitalizes eyes with a subtle blend of luminous pigments that effortlessly blends into all skin tones. —Emily Orofino, Vogue, 23 Oct. 2024

In addition to Scott, the show also stars Britt Lower, Tramell Tillman, Zach Cherry, Jen Tullock, Michael Chernus, Dichen Lachman, John Turturro, Christopher Walken and Patricia Arquette. —Zoe G. Phillips, The Hollywood Reporter, 23 Oct. 2024

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

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)