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.
Ramona High School senior Isabella Accardi has committed to Black Hills State University in Spearfish, South Dakota, as an athlete on the women’s triathlon team. Stephanie Ogilvie, San Diego Union-Tribune, 30 Dec. 2025 As the couple raised two daughters, John worked different technology jobs and photographed sporting events like triathlons on the weekends. Addie Costello, jsonline.com, 25 Dec. 2025 Though the friend and Kocher muscled through the bumpy quarter mile, Beckley refused for the sake of his brand new expensive triathlon bike. Rachel Royster, Fort Worth Star-Telegram, 23 Dec. 2025 Erica Fox was a swimmer and triathlete who had done two half-Ironmans and numerous other triathlons and who for almost 20 years did an annual triathlon called Escape From Alcatraz, her father said. Rebecca Cohen, NBC news, 22 Dec. 2025 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 Jan. 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)

More from Merriam-Webster on triathlon

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