1. half-hourly - Adjective
2. half-hourly - Adverb
3. half-hourly - Adjective Satellite
Done or happening at intervals of half an hour.
Source: Webster's dictionaryAn intensive service is provided, with service frequencies ranging from every 10 minutes (3 ferries in service) at peak times, to half-hourly (1 ferry in service) at night. Source: Internet
This channel also provides half-hourly weather summaries by forecasters from the BBC Weather centre and the sports news from the BBC Sport centre at MediaCityUK. Source: Internet