half-hourly

halfhourly

[haf-ouuhr-lee, -ou-er-, hahf-]
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:
1800–10; half + hourly

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
half-hour
 
n
1.  a.  a period of 30 minutes
 b.  (as modifier): a half-hour stint on the treadmill
2.  a.  the point of time 30 minutes after the beginning of an hour
 b.  (as modifier): a half-hour chime
 
half-'hourly
 
adv, —adj

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