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Discover LudwigThe word 'one-fifth' is correct and usable in written English.
You can use it to describe a quantity which is equal to 20% of a given whole. For example: "This cake recipe requires one-fifth of a cup of brown sugar."
Dictionary
one-fifth
adjective
Being one fifth of the usual dimension.
Exact(41)
Not more than one-fifth agree on any one definition.
One-fifth of the country is flooded.
About one-fifth of Cubans are nonreligious.
Approximately another one-fifth are Roman Catholics.
One-fifth of the wages in China.
Production declined by one-fifth this year.
Similar(19)
One fifth of all Americans.
That's one fifth of a nickel.
Less than one tenth disagrees, and one fifth is uncertain.
This is about one fifth throughout the EU.
One fifth of patients had an unanticipated renal pathology.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com