addition

noun

ə-ˈdi-shən How to pronounce addition (audio)
Definition of additionnext
1
as in extension
a smaller structure added to a main building a new addition to the library providing space for an expanded video collection

Synonyms & Similar Words

Relevance
2
as in increase
something added (as by growth) the cache of old stamps I found in the discarded desk was a huge addition to my stamp collection

Synonyms & Similar Words

Antonyms & Near Antonyms
3
as in accumulating
the act or process of becoming greater in number how do you account for the addition of more paint stains on your shirt after you put on a smock?

Synonyms & Similar Words

Antonyms & Near Antonyms

Example Sentences

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.
Recent Examples of addition Their salsas remain the same, too, but with the addition of a new, bright molcajete salsa. — Stephanie Breijo, Los Angeles Times, 12 Aug. 2026 Camera Looks is probably the most interesting addition to the Pixel camera. — ArsTechnica, 12 Aug. 2026 Sommers and McKenna had a number of tasks to juggle, but one of the more impactful for the future of Marvel was the addition of Jean Grey (Sadie Sink), the first castmember of the MCU’s new X-Men team. — Aaron Couch, HollywoodReporter, 12 Aug. 2026 New additions to the cast are Tanya Reynolds, Jude Mack, Faye Marsay, Rex Hayes, Aisling Sharkey, Abbie Hern, and Grant Feely. — Charisma Madarang, Rolling Stone, 12 Aug. 2026 See All Example Sentences for addition
Recent Examples of Synonyms for addition
  1. extension
  2. increase
  3. accumulating
  4. annex
  5. boost
  6. accumulation
  7. gain
Noun
  • Now, those extensions could end up on the chopping block, Burak said, as states seek ways to manage Medicaid losses.
    — Andrew Jones, CNN Money, 17 Aug. 2026
  • In May, Peevy was given a contract extension through 2031, the financial terms of which have not been disclosed.
    — Daniel Libit, Sportico.com, 17 Aug. 2026
Definition of extension
Noun
  • The city says there was a large increase in complaints in May, likely due to the end of the school year.
    — Ashley Portillo, CBS News, 14 Aug. 2026
  • The vaccine included a mumps strain called Urabe that was linked to an increase in meningitis in about 1 in 900 people who got that country’s original MMR vaccine — a higher rate than expected.
    — Brenda Goodman, CNN Money, 14 Aug. 2026
Definition of increase
Noun
  • While snow totals remain uncertain, this storm is forecast to bring colder air and has a better chance of bringing more widespread and meaningful accumulating snow, particularly in the mountains and higher elevations.
    — Alex Lehnert, CBS News, 14 Apr. 2026
Definition of accumulating
Noun
  • Integration architecture, auth, data flows, the technical annex.
    — Jason Snyder, Forbes.com, 8 Aug. 2026
  • During that time, the kunsthalle will relocate its main offices to an annex of the town hall located in the city’s Fourteenth Arrondissement.
    — News Desk, Artforum, 3 Aug. 2026
Definition of annex
Noun
  • If your shampoo of choice doesn’t have peppermint as a critical ingredient, try adding a few drops to the bottle for a boost.
    — BestReviews, Chicago Tribune, 13 Aug. 2026
  • The problem appears especially glaring in thinner fields that could desperately use a boost in the competition — like this year’s limited series crop.
    — David Canfield, HollywoodReporter, 12 Aug. 2026
Definition of boost
Noun
  • Food safety experts say that the accumulation of outbreaks this summer is striking but that tracking the number of outbreaks — or recalls, for that matter — isn’t the best way to capture the risk from foodborne pathogens.
    — Deidre McPhillips, CNN Money, 13 Aug. 2026
  • The measurements showed spin accumulation at the chiral copper surface, supporting the idea that the helical structure was creating spin polarization.
    — Rupendra Brahambhatt, Interesting Engineering, 10 Aug. 2026
Definition of accumulation
Noun
  • Such headwinds are unfamiliar for Reform, which had previously been in the ascendancy, leading national opinion polls and enjoying historic gains in local elections.
    — Reagan Yip, CNN Money, 14 Aug. 2026
  • Later in the game, Williams caught a downfield hitch and broke a tackle for a 25-yard gain.
    — Chad Graff, New York Times, 14 Aug. 2026
Definition of gain

Phrases Containing addition

Browse Nearby Words

adding up (to)
addition
additional
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Cite this Entry

“Addition.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/addition. Accessed 18 Aug. 2026.

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More from Merriam-Webster on addition

Nglish: Translation of addition for Spanish Speakers

Britannica.com: Encyclopedia article about addition

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