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The phrase "about one seventh" is correct and usable in written English.
It can be used when estimating a fraction or proportion of something, typically in a mathematical or descriptive context.
Example: "The project is about one seventh complete, and we expect to finish it by the end of the month."
Alternatives: "approximately one seventh" or "roughly one seventh".
Exact(5)
Equation (9) suggests that if the H-range of a magnetic storm is doubled, the occurrence frequency decreases to about one seventh of the reference value.
For the full sample, the estimate of γ with MSA fixed effects is −0.030, about one seventh as large as the estimate from our base specification.
The coefficients determined with the maximum likelihood method show that when the H-range of a magnetic storm at Kakioka is doubled, the frequency of the magnetic storm is about one seventh, for example.
The 9,728 tickets available in L.A. are about one seventh the Broadway inventory.
A river with an annual discharge about one seventh that of the Mississippi is stopped by a simple dirt wall.
Similar(55)
It invited about 550 unpledged elected and party officials to occupy about one-seventh of the convention seats.
The South has about one-seventh of the nation's population, including many people of European ancestry, particularly from Germany and Italy.
In tropical latitudes the ocean accounts for a third or more of the poleward heat transport; at latitude 50° N, the ocean's share is about one-seventh.
Parcels' share was about one-sixth.
Trade taxes account for about one-fifth; corporate income tax, about one-eighth.
Manufacturing contributed about one-fifth to GDP and employed about one-fourth of the labour force.
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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