noun
triathlon
treye-ATH-lon
noun
1
An endurance sporting event combining swimming, cycling, and running, completed one after another.
"She finished her first triathlon in just under three hours."
How to Use Triathlon
Learner’s notesIn plain EnglishA race combining swimming, cycling, and running back to back.
Common pairings
train for a triathlon
compete in a triathlon
Word Forms
triathlons plural
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Etymology
Formed from tri- ("three") plus the -athlon of decathlon and pentathlon, itself from Greek athlon, "contest."