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halfhourly

[haf-ouuh r-lee, -ou-er-, hahf-] /ˈhæfˈaʊər li, -ˈaʊ ər-, ˈhɑf-/
adjective
1.
half-hour (def 3).
2.
occurring every half-hour:
a halfhourly interruption.
adverb
3.
at half-hour intervals:
The bell rang halfhourly.
Origin
1800-1810
1800-10; half + hourly
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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10
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