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Related to at intervals: intervallic
Separated by a particular amount of space or time. Make sure to position those Christmas lights so that the flashing ones appear at intervals.
at (...) ˈintervals
1 with time between: Buses to the city leave at regular intervals. ♢ The runners started at 5-minute intervals.
2 with spaces between: Flaming torches were positioned at intervals along the terrace.
In a series separated by space or time: trees planted at intervals; coughing at intervals.