I was looking for a word that means "25 years" in the way that "bicentennial" refers to 200 years.

Wikipedia suggests "Quadranscentennial", but I can't find extensive use of that.


Is there any word for what I'm looking for?

  • 2
    Quarter of a century? That's the most common
    – Bidella
    Feb 29, 2012 at 0:14
  • If you are writing and you native tongue is not English, I would avoid anything other than a quarter century or 25 years.
    – Lambie
    Aug 26, 2021 at 16:35

9 Answers 9


A 25th anniversary is a silver jubilee or silver anniversary, and a celebration of that milestone would be a Silver Jubilee.

The corresponding 50th anniversary is a golden jubilee, after which usage varies; when celebrating personal achievements it is a diamond jubilee at 60 and platinum at 70, as in the reign of a monarch, but the 75th anniversary of the founding of the Boy Scouts of America, for example, was a diamond jubilee.

If you want to mark a period of time rather than the milestone, then quarter century would do the trick as well as simply saying 25th anniversary or 25 years.

  • 3
    You didn't answer the asked question, which is to find a word of the same form as bicentennial. Feb 29, 2012 at 1:01
  • Right, I'm familiar with the those terms. But I'm looking for a word like bicentennial.
    – Yahel
    Feb 29, 2012 at 2:15
  • 3
    The stated question was "a word that means '25 years' in the way that 'bicentennial' refers to 200 years." I provided a phrase, but a phrase that means 25 years and which I use in the exact scenarios I use "bicentennial." If that's not sufficient, the OP needs to revise the question and be more specific.
    – choster
    Feb 29, 2012 at 20:40

Note the comments entry for quadranscentennial as a term for 25th anniversary in that Wikipedia link:

Probably a modern coined term

Probably correct, in my opinion.

There are a few usages of quadranscentennial as a 25th anniversary event e.g. the Bhutan Quadranscentennial of Apollo 11 commemorative stamp issued in 1994. But I am uncertain if that was a transcription or spelling error, as I could not find any confirmation from an official Bhutan website.

For wedding commemoration, or regency, a term in current use is "Silver Anniversary". Or "Silver Jubilee" in the case of regents. It isn't a Latin-ate term. But it is a commonly understood term.


If semicentennial (semi-, precisely half, + centennial, a period of 100 years) is 50 years, then quarticentennial (quart-, a combining form meaning "a fourth," + centennial) is properly the -ennial word meaning 25 years (and arguably more correct than quadrancentennial, since there is no combining form of quadrant).


As you pointed out, quadranscentennial is the technical term and it is not widely used. I have seen either:

  • 25th Anniversary or
  • Every 25 years

Depending on whether you're talking about a one-time event (like a wedding anniversary) or a repeating event (none come to mind).

  • In this case, its my 25th birthday, and I'd like a nice word to describe the achievement of having survived for a quarter century. :)
    – Yahel
    Feb 29, 2012 at 2:16
  • In that case I would go with Silver Birthday, as others have said. I don't think a cooler name exists.
    – Lynn
    Feb 29, 2012 at 6:08

A period of 25 years is a "Generation". The time from birth to someone having a child of their own and starting the next generation.


If you want to coin words try Latin-English viginti-quinque-ennial. Latin viginti is twenty, quinque five.

  • 1
    One can do better than that:languagehat.com/dodrans
    – tchrist
    Feb 22, 2015 at 3:41
  • You should know how to place words in italics or bold, it would make your answers so much clearer!
    – Mari-Lou A
    Feb 22, 2015 at 9:36
  • You are absolutely right. I should try to learn it. There are so many typographical tricks on Este that I never dared to study the help pages.
    – rogermue
    Feb 22, 2015 at 9:54
  • Place one * before and after the word or phrase for italics and two ** before and after (no spaces) for bold
    – Mari-Lou A
    Feb 22, 2015 at 11:51
  • Thanks Mari-Lou. I've just tried it for the first time. It's easier to type the asterisks. Using the icons for bold and italics is a bit cumbersome.
    – rogermue
    Feb 22, 2015 at 11:56

I like the word “quarticentennial” suggested by Ellie Kesselman above. Like the words decennial, every 10 years, and bicentennial, it’s a consistent pairing with the “-centennial “ or “-cennial” root and Latin prefixes.

However, a centennial is an event, celebrated at 100 years. Words with the “-cennial” root, like decennial, refer to a repeating cycle, e.g. every 10 years.

However, in the spirit of brevity, for a word describing the cycle of every 25 years, what about “quarcennial”? “Quarti-“ just stumbles when spoken. After all, we say “Quarter-horse”, not “Quarti-horse”. “Quartercennial” is perhaps most correct, every quarter-century.

Similarly, in the spirit of simplicity, albeit not word length, “quarter-centennial” to describe an event celebrated at 25 years is perhaps best of all, which was, I think, the original question.


The term "quadrans" (like "quadrant") means a fourth or a quarter (it was the name of a Roman coin), so a quadranscentennial is a fourth of a centennial — i.e., 25 years.

  • 2
    Did you notice all the other answers with the same suggestion?
    – Mitch
    Apr 4, 2013 at 22:32

Perhaps the coumpound noun 'quad-centary' may suffice, which seems akin to 'bi-centary' (50 years)

  • 1
    Neither bi-centary nor quad-centary is a word. Feb 22, 2015 at 0:31

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