What does "half-hourly" mean?
Once every half-hour, every 30 minutes.
adj, adv ·Rare ·Advanced level
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"a half-hourly train service"
"Take this medicine half-hourly."
"A new half-hourly service between Stratford [Greater London] and Meridian Water was introduced on 9 September by Greater Anglia."
Once every half-hour, every 30 minutes.
Common synonyms include: semihourly, semihourly.
A new half-hourly service between Stratford [Greater London] and Meridian Water was introduced on 9 September by Greater Anglia.
From half-hour + -ly.