Plural of “stadium”

The plural of stadium is stadiums (some dictionaries also accept stadia).

Why

"Stadium" comes from the Greek "stadion," originally a unit of distance roughly equal to 600 Greek feet — specifically, the length of the footrace track at the ancient Olympic Games in Olympia — before it came to describe the racetrack itself, and eventually the whole structure surrounding it. The word passed through Latin as "stadium" and, in its modern sense as a large sports arena, entered English fully within the era of regular -s pluralization.

"Stadia" hasn't vanished the way "musea" has, but it survives today mostly in a completely different, technical sense: in surveying, a "stadia rod" is a graduated measuring pole, and "stadia" in that field refers to a distance-measurement method, not to multiple sports arenas. That specialized split means "stadia" rarely if ever competes with "stadiums" for the sports-arena meaning most people actually use the word for.

Usage note

"Stadiums" is standard for describing multiple sports venues in every context, from local journalism to architecture. "Stadia" should be reserved for its distinct surveying and measurement sense, or occasionally for deliberately classical writing about ancient Greek racetracks, where it retains its original meaning of a unit of distance.

Modern stadium design has shifted dramatically toward multi-purpose venues capable of hosting concerts, conventions, and multiple sports within the same structure, a far cry from the single-purpose Greek stadion, which existed for exactly one event, the footrace, and nothing else.

Common real mistakes

Writers sometimes reach for "stadia" thinking it's simply the more correct or formal plural of the sports-venue sense, unaware that the word has effectively split into two separate technical vocabularies with different plurals; using "stadia" to mean multiple sports arenas will read as odd or archaic to most readers rather than as more precise. A further point of care: a small local sports field with limited seating is more accurately called a "field" or "ballpark" rather than a "stadium," a term generally reserved for large-capacity venues.

The wider pattern

"Stadium" illustrates a distinct pattern in this family of words: rather than one plural simply winning out over another the way "cacti" and "cactuses" compete for the same meaning, "stadium" split into two separate senses that each kept a different plural, similar to how "genius" split into "geniuses" (talented people) and "genii" (spirits) in some older usage. The ancient Greek stadion at Olympia, roughly 192 meters long, still partly survives today and remains a popular archaeological site, letting modern visitors walk the exact length that gave the word its original meaning before it ever referred to a surrounding structure at all.

Examples

• The city built two new stadiums for the upcoming championship.
• Fans filled the stadiums across the country for opening weekend.
• The surveyor used stadia measurements to map the property line.
• Several stadiums were demolished to make way for mixed-use developments.
• The tour included visits to some of Europe's oldest stadiums.
• Both stadiums sold out within minutes of tickets going on sale.
• The company holds naming rights to three different stadiums.
• Ancient Greek stadia measured roughly six hundred feet in length.
• The concert tour will play in stadiums across twelve cities.
• New safety codes require inspections of all major stadiums annually.
• Visitors can still walk the length of the ancient stadion at Olympia.
• The two new stadiums were funded partly through public bonds.
• Renovated stadiums across the league added retractable roofs over the past decade.
• The multi-purpose stadium hosts everything from soccer matches to major concerts.
• Construction crews finished both new stadiums just weeks before opening day.
• The half-empty stadium still erupted when the home team scored in the final minute.
• Groundskeepers worked overnight to prepare both stadiums for the doubleheader.
• Fireworks lit up the sky above both stadiums after the final whistle.