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Discover LudwigThe phrase "at a single" is correct and usable in written English.
It can be used when referring to something occurring or being done at one specific point or instance.
Example: "The event was so popular that tickets sold out at a single moment."
Alternatives: "in one go" or "at one time".
Exact(58)
"You'd get four and five thousand at a single party.
At a single shouted word everyone sat down.
It must be used at a single meal.
Current laws allow only one prostitute at a single address.
"He has to be, at a single hospital".
From that show he considered looking at a single designer.
Your eyes take in the pictures at a single glance.
So looking at a single year's number is often misleading.
The review did not look at a single intervention.
However, P-wave triggering was observed at a single station.
It was an observational analysis done at a single institution.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com