デカスロンデカスロンMeanings1noundecathlonStandard term for the ten-event track and field competition. The Japanese synonym 十種競技 (じっしゅきょうぎ) is also common.See also: 十種競技 (じっしゅきょうぎ)彼かれはデカスロンで金きんメダルを取とった。He won the gold medal in the decathlon.