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Discover LudwigThe phrase "one-time only" is correct and usable in written English
It is typically used to indicate that something is available or valid for a single occasion or instance. Example: "This offer is a one-time only deal, so make sure to take advantage of it while you can."
Exact(8)
Therefore, this should be strictly a one-time only event.
"As far as I am concerned, it's a one-time only exception.
However, most of the clients had limited purchasing power and most transactions were one-time only.
An exclusive one-time only discount?
It's a one-time only project.
This is a one-time only award.
Similar(51)
One time only!
"One time only," he muttered.
It would have been one time only.
"One time only -- to say goodbye," Mr. Eldridge said.
"They knew this would be one time only," she said.
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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