Definition of triathlon noun from the Oxford Advanced American Dictionary

 

triathlon

 noun
noun
NAmE//traɪˈæθlɑn//
 
, NAmE//traɪˈæθlən//
 
 
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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 the Oxford Advanced Learner's Dictionary entry: triathlon