Definition of "half-hourly" [half•-hour•ly]

• Once every half-hour. (adjective)
• Once every half-hour. (adverb)

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• "Euronews will broadcast a selection of the questions – and MEPs, think-tank representatives and other Brussels commentators 'answers to them – at the end of its half-hourly news bulletins, which reach 256 million households in 144 countries."
• "At least Belleville, North Bay and other cities smaller than Niagara Falls have half-hourly service and Sunday service."
• "“At least Belleville, North Bay and other cities smaller than Niagara Falls have half-hourly service and Sunday service.”"