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Discover LudwigThe phrase "every 9th" is correct and usable in written English
It can be used to indicate something that occurs at regular intervals, specifically every ninth item or occurrence in a sequence. Example: "The event will take place every 9th day of the month."
Exact(5)
The Wagener group has synthesized butyl-branched polyethylenes in which the branch appears every 9th, 21st, 39th, and 75th [46] carbon (Fig. 7).
Several times a month, in preparation for a statewide math exam later this school year, the opening minutes of every 9th and 10th grade class at Northwest Cabarrus High are devoted to math, no matter whether the class is Latin, history or physical education.
Series of the brain slices were made up randomly of one section from every 9th for the immunohistochemical analysis.
A new item was read every 9th second.
Measurement of all lesions reported at baseline and screening for new lesions were performed every 9th week with the same method as used at baseline.
Similar(55)
stsplit sp, every(1).
Every 79.
Last season: Once every 109.
Elections held every 4 years.
Sperm divide every 15 days.
Baste every 20 minutes.
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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