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, Starbucks plans to bring back condiment bars, a move aimed at reducing barista workload. —Francisco Velasquez, Quartz, 15 Nov. 2024

In addition, some wild animals in zoos have been bred under human care and over time, might become susceptible to allergies through genetic drift. —Jen McCaffery, Discover Magazine, 14 Nov. 2024

In addition, the home is equipped with a two-car garage, accommodating vehicles and storage needs efficiently. —Bay Area Home Report, The Mercury News, 13 Nov. 2024

In addition to Trump, the White House extended an invitation to Melania Trump, but a source familiar with the planning said she is not expected to accompany her husband. —Elizabeth Robinson, NBC News, 13 Nov. 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)