half-hourlyadjective [ before noun ], adverb
uk/ˌhɑːfˈaʊe.li/us/ˌhæfˈaʊr.li/happening twice every hour:
There's a half-hourly train service to London from here.
Thesaurus: synonyms and related words
Relating to regular periods of time
- -ly
- afternoons
- annual
- annum
- bi
- biannual
- biennial
- daily
- evenings
- fortnight
- hourly
- monthly
- nights
- pa
- pcm
- per annum
- per calendar month
- pw
- quarterly
- season
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