semihourly
adj 2adv 2
Definitions
adj
1
Half-hourly: occurring every thirty minutes.
The warship rang its semihourly bell, announcing it was now half past 10 o'clock.
2
Roughly (but not exactly) hourly: occurring around every sixty minutes.
adv
1
Half-hourly: at intervals of 30 minutes.
Samples were collected semihourly (on the hour and half hour) throughout the study.
2
Roughly (but not exactly) hourly: at intervals of around 60 minutes.
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