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half-marathon

noun [C]
 
 
/ˌhɑːfˈmær.ə.θən/ US  /ˌhæfˈmær.ə.θɑːn/

Definition

a running race over a distance of about 21 kilometresAthletics
(Definition of half-marathon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of half-marathon