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English definition of “half-marathon”

half-marathon

noun [C] uk   /ˌhɑːfˈmær.ə.θən/ us    /ˌhæfˈmær.ə.θɑːn/
a running race over a distance of about 21 kilometresAthletics
(Definition of half-marathon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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