Definition of heptathlon noun from the Oxford Advanced American Dictionary

 

heptathlon

 noun
noun
NAmE//hɛpˈtæθlɑn//
 
, NAmE//hɛpˈtæθlən//
 
 
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a sports event, especially one for women, in which people compete in seven different sports compare biathlon, decathlon, pentathlon, tetrathlon, triathlon
See the Oxford Advanced Learner's Dictionary entry: heptathlon