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"three fold" is correct and usable in written English.
You can use it when you want to indicate that something has increased or decreased by a factor of three. For example, "The company's profits increased three fold over the course of the last year."
Exact(7)
The method is three fold.
The contribution is three fold.
Three fold increase in information sharing per person.
My argument is three fold.
But the Secret Service protection duties are three fold.
The main idea of this article is three fold.
Similar(52)
"Uptake varies two to three-fold across the country.
Radcliffe's defence was three-fold.
The benefits would be three-fold.
The reasons appear to be three-fold.
"The challenges for us are three-fold.
Write better and faster with AI suggestions while staying true to your unique style.
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