Occurring or done every half hour; happening at thirty-minute intervals.
From 'half' + 'hour' + '-ly'. This compound formed in the modern era to describe recurring events at thirty-minute intervals. The '-ly' suffix creates both adjective and adverb forms from the time-based noun.
Halfhourly is a modern bureaucratic word—think buses, trains, and shift schedules. It emerged because our industrial society needed precise vocabulary for frequent but not constant events, showing how transportation and commerce shaped modern English.
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