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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
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 Mara Flavia Souza Araujo, 38, drowned during the swim portion of the Ironman Texas triathlon in The Woodlands on Saturday, according to authorities. Amber Harding Outkick, FOXNews.com, 20 Apr. 2026 Araújo — who had over 60,000 followers on Instagram and was known for sharing fitness content — drowned while competing in the swim portion of a triathlon competition in The Woodlands, Texas, on April 18, the Montgomery County Sheriff's Department (MCSD) previously confirmed to PEOPLE. Luke Chinman, PEOPLE, 20 Apr. 2026 The triathlon, officially named the Memorial Hermann IRONMAN Texas, was being held in The Woodlands, located about 30 miles north of Houston. Matthew Ablon, CBS News, 18 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 27 Apr. 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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