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halfhourly

[haf-ouuh r-lee, -ou-er-, hahf-]
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adjective
  1. half-hour(def 3).
  2. occurring every half-hour: a halfhourly interruption.
adverb
  1. at half-hour intervals: The bell rang halfhourly.

Origin of halfhourly

First recorded in 1800–10; half + hourly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018