Definition of triathlon noun from the Oxford Advanced Learner's Dictionary

 

triathlon

 noun
noun
BrE BrE//traɪˈæθlən//
 
; NAmE NAmE//traɪˈæθlən//
 
Cycling, Water sports
 
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a sporting event in which people compete in three different sports, usually swimming, cycling and running compare biathlon, decathlon, heptathlon, pentathlon, tetrathlon See related entries: Cycling, Water sports Word Origin 1970s: from tri- ‘three’, on the pattern of decathlon.
See the Oxford Advanced American Dictionary entry: triathlon