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

 

pentathlon

 noun
noun
BrE BrE//penˈtæθlən//
 
; NAmE NAmE//penˈtæθlən//
 
Athletics, Combat sports
 
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a sporting event in which people compete in five different sports (running, riding, swimming, shooting and fencing ) compare biathlon, decathlon, heptathlon, tetrathlon, triathlon See related entries: Athletics, Combat sports Word Origin early 17th cent. (denoting the original five events of leaping, running, discus-throwing, spear-throwing, and wrestling): from Greek, from pente ‘five’ + athlon ‘contest’.
See the Oxford Advanced American Dictionary entry: pentathlon