Word.ws English Dictionary

sesquicentennial

/ˌsɛskwɪsɛnˈtɛni.əl/

sesquicentennial adjective: occurring every 150 years.

Adjective

sesquicentennial (not comparable)

  1. Occurring every 150 years.
  2. Of, or relating to a sesquicentenary.

Noun

sesquicentennial (plural sesquicentennials)

  1. A 150th anniversary.
    • The city celebrated its sesquicentennial last year.
    • Sesquicentennial, I know I’ll see myself here again / And I guess only time will tell, will it ever be like it was then / Sesquicentennial, oh here we go again2026, “Sesquicentennial”, performed by Sofie Royer

Forms of sesquicentennial

pluralsesquicentennials

Origin of sesquicentennial

From sesqui- (“one-and-a-half”) + centennial (“of 100 years”). By surface analysis, sesqui- + cent- + -ennial.

Words formed from sesquicentennial

Questions about sesquicentennial

What does sesquicentennial mean?
Sesquicentennial means occurring every 150 years.
What part of speech is sesquicentennial?
Sesquicentennial can be an adjective or a noun.
How do you pronounce sesquicentennial?
Sesquicentennial is pronounced /ˌsɛskwɪsɛnˈtɛni.əl/.

Words near sesquicentennial in the dictionary

  1. sesquicarbonates
  2. sesquicentenarian
  3. sesquicentenarians
  4. sesquicentenaries
  5. sesquicentenary
  6. sesquicentennial
  7. sesquicentennially
  8. sesquicentennials
  9. sesquicentury
  10. sesquichloride
  11. sesquichlorides

Source and license

Adapted from Wiktionary: sesquicentennial (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Pronunciation audio from Wikimedia Commons, each file under its own free license: en-us-sesquicentennial.ogg.

Cite this entry: “sesquicentennial.” Word.ws, https://word.ws/sesquicentennial. Based on Wiktionary, CC BY-SA 4.0.