What Is a Semiquincentennial? A Guide to Major Anniversary Milestones
There’s a (quite lengthy!) word that’s become closely associated with the United States’ 250th anniversary of independence 🇺🇸: semiquincentennial.
If it looks a bit overly… polysyllabic, well, at least it’s tradition. English has a long history of creating specialized words like these for anniversaries. Some, like centennial, are familiar. Here’s a guide to some of the most useful milestone terms.
What does semiquincentennial mean?
A semiquincentennial is a 250th anniversary. The word breaks down into three parts: (1) semi, meaning “half,” (2) quinque (often shortened to quin), meaning “five,” and (3) centennial, meaning “relating to 100 years.” Put together, it literally means “half of five hundred years,” or 250 years.
Did you know...?
You may occasionally encounter other terms for a 250th anniversary, including bisesquicentennial, sestercentennial, and quarter millennium. They all arrive at the same number — 250 — in different ways. For example, sestercentennial combines sester-, a Latin-derived element meaning “two and a half,” with centennial, meaning “hundredth anniversary.” Bisesquicentennial, meanwhile, combines bi– (“two”) and sesqui– (“one and a half”) before centennial. And quarter millennium simply means “a quarter of a thousand years.” Of these, semiquincentennial has emerged as the most widely used in official planning and media coverage.
Centennial, sesquicentennial, bicentennial, and beyond
English has developed a whole family of anniversary words built around Latin number roots.
- Centennial = 100th anniversary
- Sesquicentennial = 150th anniversary
- Bicentennial = 200th anniversary
- Semiquincentennial or sestercenntenial= 250th anniversary
- Tricentennial = 300th anniversary
- Quatercentenary or quatercentennial = 400th anniversary
- Quincentenary or quincentennial = 500th anniversary
- Millennium = a 1,000th anniversary, or millennial = relating to a period of 1,000 years
Why are some of these words so complicated?
Many of these milestone terms were built from Latin numerical elements during the 18th and 19th centuries, when scholars, governments, newspapers, and civic organizations wanted precise names for anniversaries and commemorations.
Take quincentenary, meaning “a 500th anniversary.” It combines a shortened form of Latin quinque (“five”) with centenary, referring to a period of a hundred years.
Similarly, semiquincentennial may look like a linguistic monster, but it’s really a mathematical equation disguised as a word. Fortunately, some milestone anniversaries come with simpler names. When Sweden turned 500 in 2023, for instance, it celebrated a pure quincentennial.
