
1) Ancient Olympic sport 2) Multilingual journal 3) Obsolete unit of measurement 4) Unit of length
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https://www.crosswordclues.com/clue/stadion
[journal] Stadion is a multilingual academic journal covering the history of sport. The editors-in-chief are Manfred Lämmer, Thierry Terret, and Maureen Smith (German Sport University Cologne). ...
Found on
http://en.wikipedia.org/wiki/Stadion_(journal)
[running race] Stadion or stade (στάδιον) was an ancient running event, part of the Olympic Games and the other Panhellenic Games. It was one of the five major Pentathlon events. It was the premier event of the gymnikos agon (nude competition). From the years 776 to 724 BC, the stadion was the only event that took place at the Olympi...
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http://en.wikipedia.org/wiki/Stadion_(running_race)
[state] Stadion was a statelet of the Holy Roman Empire, located around Thannhausen in the present-day Bavarian administrative region of Swabia, Germany. The Swabian Stadion dynasty was first mentioned in the area of Oberstadion in the 13th century. John Philipp of Stadion (1652–1741), civil servant of the Mainz archbishops, was elevated ...
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http://en.wikipedia.org/wiki/Stadion_(state)
[unit of length] The stadion, Latinized as stadium and anglicized as stade, is an ancient Greek unit of length. According to Herodotus, one stade is equal to 600 feet. However, there were several different lengths of `feet”, depending on the country of origin. Which measure of the stadia is used can affect the interpretation of ancient te...
Found on
http://en.wikipedia.org/wiki/Stadion_(unit_of_length)

in ancient Greek athletic competition, a running race of 200 meters, approximately 200 yards.
Found on
https://www.encyclo.co.uk/local/10135
No exact match found.