half-hourly
advEtymology From half-hour + -ly.
1
At intervals of a half-hour, every 30 minutes.
- Take this medicine half-hourly.
- Synonyms
- twice-hourly, semihourly
half-hourly
adjEtymology From half-hour + -ly.
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.2019 October, “Lee Valley shuttle service launched”, in Modern Railways, page 18:
- Synonyms
- semihourly