From Longman Dictionary of Contemporary Englishhalf-yearlyˌhalf-ˈyearly adjective, adverb TMCdone or happening every six months half-yearly meetings The interest you earn will be paid half-yearly in June and December.From Longman Business Dictionaryhalf-yearlyˌhalf-ˈyearly adjective, adverb every six monthshalf-yearly meetingsThe interest you earn will be paid half-yearly in June and December.