triathlon

noun

tri·​ath·​lon trī-ˈath-lən How to pronounce triathlon (audio)
-ˌlän
nonstandard -ˈa-thə-
Synonyms of triathlonnext
: an athletic contest that is a long-distance race consisting of three phases (such as swimming, bicycling, and running)

Examples of triathlon in a Sentence

Recent Examples on the Web
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Bérenice Bejo and Nassim Lyes reprise their respective roles of marine scientist Sophia and river police commander Adil who previously joined forces when killer sharks arrived in the Seine in the lead-up to the Paris Olympics triathlon swimming heats in the famed river. Melanie Goodfellow, Deadline, 1 May 2026 The annual Orange County Multi-Sport Festival featured several events for beginner and advanced competitors, including an Olympic-length triathlon, a sprint triathlon, a duathlon relay, a 5K and even a triathlon for kids, among others. Heather McRea, Oc Register, 26 Apr. 2026 On April 18, Araújo — who had over 60,000 Instagram followers and was known for sharing fitness content — drowned while competing in the swim portion of a triathlon competition in The Woodlands, Texas, the Montgomery County Sheriff's Department (MCSD) previously confirmed to PEOPLE. Luke Chinman, PEOPLE, 24 Apr. 2026 Hoka sponsors several road and track, trail, and triathlon athletes, as well as road races like the Big Sur International Marathon, and is generally a big name in the running world. Madison Flager, Condé Nast Traveler, 22 Apr. 2026 See All Example Sentences for triathlon

Word History

Etymology

tri- + -athlon (as in decathlon)

First Known Use

1924, in the meaning defined above

Time Traveler
The first known use of triathlon was in 1924

Browse Nearby Words

Cite this Entry

“Triathlon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/triathlon. Accessed 6 May. 2026.

Kids Definition

triathlon

noun
tri·​ath·​lon ˌtrī-ˈath-ˌlän How to pronounce triathlon (audio)
: an athletic contest that is a long-distance race consisting of three phases (as swimming, bicycling, and running)

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