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Adjective: half-hourly  ,hãf'aw(-u)r-lee
  1. Occurring every half hour
    "The bus runs on a half-hourly schedule during peak times"
Adverb: half-hourly  ,hãf'aw(-u)r-lee
  1. Every thirty minutes, every half hour
    "The buses run half-hourly during peak hours"

See also: periodic, periodical