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Definition of half-hourly adjective from the Oxford Advanced Learner's Dictionary

half-hourly

adjective
 
/ˌhɑːf ˈaʊəli/
 
/ˌhæf ˈaʊərli/
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  1. happening every 30 minutes
    • a half-hourly bus service
    Topics Timec2
See half-hourly in the Oxford Advanced American Dictionary

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