on the hour
When bells chime
On the hour means at exactly the top of each hour—when the minute hand reaches twelve: The bus departs on the hour.
It often implies regular intervals: News updates run on the hour, every hour.
Something happening on the hour is precisely timed, not a few minutes before or after.
- appointmentScheduled time for something
- clockDevice displaying time
- minuteSixtieth of an hour
- news bulletinBrief broadcast announcement
- timetableArranged list of events
routine · punctuality · announcement · train schedule · live stream · second · split second · Greenwich Mean Time · synchronization · deadline · atomic clock · station identification · stopwatch · time signal · time check · half past · chime · church bells
temporal regularity
on the hourat random
Without deliberate selection
irregularly · sporadically · unpredictably · whenever · intermittently