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

Entertainment & Arts La Jolla Playhouse’s immersive ‘La Lucha’ finds heartbreak and mystery in the world of lucha libre wrestling May 1, 2023 The company plans to expand its reach this way, in addition to increasing its venue space. —Emily St. Martin, Los Angeles Times, 27 Sep. 2023

In addition to their Broadway fame, Raver-Lampman is well known for her Netflix series The Umbrella Academy, while Diggs has a leading role in TNT's Snowpiercer. —Kelsie Gibson, Peoplemag, 27 Sep. 2023

In addition to the termination of multiple business deals, the rapper was left without a record label or publishing deal following the conclusion of his contracts with Universal Music Group and Sony. —Larisha Paul, Rolling Stone, 26 Sep. 2023

In addition to raises, writers secured a 76% increase in their foreign streaming residuals. —Matthew Rodriguez, CBS News, 26 Sep. 2023

In addition to a TSA PreCheck or Global Entry membership fee, cardholders also qualify for a credit of up to $189 per year toward a Clear Plus membership, which offers travelers the opportunity to skip the document-check part of the airport security line and instead opt for a biometric-screening. —Emily Sherman, wsj.com, 26 Sep. 2023

In addition to gray, black, and white options, the knee-high socks also come in fun bright colors. —Talia Ergas, Travel + Leisure, 26 Sep. 2023

In addition to his dazzling fielding, Mr. Robinson hit .429 during the series, with two home runs and six runs batted in, for one of the most spectacular performances in World Series history. —Gary Gately, Washington Post, 26 Sep. 2023

In addition to the 12 x 24-foot floor plan of this shed, there is a loft that has 4.25 feet of headroom for an additional layer of storage. —Laura Kristine Miller, Better Homes & Gardens, 26 Sep. 2023

See More

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)