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Discover LudwigThe phrase "once per" is grammatically correct and can be used in written English.
It is commonly used to express frequency, meaning something happens once in a certain period of time. Example: I can only go grocery shopping once per week due to my busy schedule.
Exact(60)
The batches are swirled around once per day.
You can do this once per day.
Earthquakes occur there about once per year.
The accelerometer is sampled once per frame.
Thread 1 executes once per second.
The class will meet once per week.
Applications are reviewed once per semester.
Each group will meet once per week.
GPS typically calculates coordinates once per second.
Yields were measured once per bloc.
The car runs once per year.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com