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Related to interval: Interval scale, Interval training

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 ?
And at this moment I can see your Line, or side -- or inside as you are pleased to call it; and I can see also the Men and Women on the North and South of you, whom I will now enumerate, describing their order, their size, and the interval between each.
We both saw the patient at intervals in the course of the night.
He took off his hat, and unbuttoned his waistcoat, and lit his everlasting pipe, and growled and grumbled between his teeth in the intervals of smoking.
This cylinder, in order to maintain its equilibrium, had to be bound by iron bands, and firmly fixed at certain intervals by cross-clamps fastened into the stone lining; after the castings these would be buried in the block of metal, leaving no external projection.
And after this interval, variety a1 is supposed in the diagram to have produced variety a2, which will, owing to the principle of divergence, differ more from (A) than did variety a1.
The course of time had flowed through the interval since the winter peacefully and happily in our new home.
The lamps were fixed at intervals against the wall, encircling the whole room.
His conversation was in free and easy defiance of Murray's Grammar,[1] and was garnished at convenient intervals with various profane expressions, which not even the desire to be graphic in our account shall induce us to transcribe.
I began it during the happier period of my life, and have continued it at intervals since.
At the time when they left the Bannacks Snake River was frozen hard: as they proceeded, the ice became broken and floating; it gradually disappeared, and the weather became warm and pleasant, as they approached a tributary stream called the Little Wyer; and the soil, which was generally of a watery clay, with occasional intervals of sand, was soft to the tread of the horses.
I was almost a cripple, and the pain I endured at intervals was agonizing.
At its foot the banks are rather less than thirty feet high the remainder of its margin being in mountains, intervals, and points.
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.
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.