interval

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at regular intervals

[of things in a series] at points that are equally distant from each other. You will find service stations at regular intervals along the highway. There are street lights at regular intervals on the main street of town.
See also: interval, regular

at intervals

In a series separated by space or time: trees planted at intervals; coughing at intervals.
See also: interval
References in classic literature ?
At certain intervals, the original wildness broke out in the natures of Brutus and Cassius.
There was no pause, no pity, no peace, no interval of relenting rest, no measurement of time.
Six distinct reports I counted, and after a long interval six again.
The next day the travellers came to where the hills closed upon the river, leaving here and there intervals of undulating meadow land.
Regardless of everything but my own sorrow, I remained in the Ti for several hours, until shouts proceeding at intervals from the groves beyond the house proclaimed the return of the natives from the beach.
The residue of the year, from the middle of March to the middle of October, an interval of seven months, is serene and delightful.
Adam, leaving his wife free to follow her own desires with regard to Lilla and her grandfather, busied himself with filling the well-hole with the fine sand prepared for the purpose, taking care to have lowered at stated intervals quantities of the store of dynamite, so as to be ready for the final explosion.
There were long tables covered with cloths, with big glass bottles of water at intervals, and down the centre salt cellars and bottles of vinegar.
All were silently crossing themselves, and the reading of the church service, the subdued chanting of deep bass voices, and in the intervals sighs and the shuffling of feet were the only sounds that could be heard.
Only at intervals the silence was faintly disturbed, when the restless turning of one of the girls in her bed betrayed itself by a gentle rustling between the sheets.
By way of ornament to the dull brown walls, icicles appear in the crevices of the timber, gleaming at intervals in the red fire-light.
In her brief intervals of repose, her brother watched the sick man in her place.
But for months afterward, at irregular intervals of a few days, the voice was heard by the several members of the family, and by others.
continued in a desultory way at long intervals until 1906.
I use all the hyperbole of metaphor, and tell what centuries of time and profounds of unthinkable agony and horror can obtain in each interval of all the intervals between the notes of a quick jig played quickly on the piano.