half-hourly
adj 1adv 1
Definitions
adj
1
Once every half-hour, every 30 minutes.
a half-hourly train service
A new half-hourly service between Stratford [Greater London] and Meridian Water was introduced on 9 September by Greater Anglia.
adv
1
At intervals of a half-hour, every 30 minutes.
Take this medicine half-hourly.
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