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halfhourly

[ haf-ouuhr-lee, -ou-er-, hahf- ]
/ ˈhæfˈaʊər li, -ˈaʊ ər-, ˈhɑf- /
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adjective

occurring every half-hour: a halfhourly interruption.

adverb

at half-hour intervals: The bell rang halfhourly.

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Origin of halfhourly

First recorded in 1800–10; half + hourly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
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