: an athletic contest that is a long-distance race consisting of three phases (as swimming, bicycling, and running)
Origin of TRIATHLON
(as in decathlon
First Known Use: 1973
triathlon noun (Concise Encyclopedia)
Endurance contest involving swimming, cycling, and running. Triathlons originated in California in the 1970s and became an Olympic event in 2000. Olympic and world championship triathlons consist of a 1.5-km open water swim, a 40-km bicycle ride, and a 10-km run. The sport's most famous event, the Ironman triathlon, is held annually in Hawaii and consists of a 3.8-km (2.4-mi) swim, a 180-km (112-mi) bicycle ride, and a 42.2-km (26.2-mi) marathon run.
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