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The phrase "a principal reason" is correct and usable in written English.
It can be used when identifying a primary cause or motivation behind an action or situation.
Example: "The lack of funding was a principal reason for the project's failure."
Alternatives: "a key reason" or "a major factor".
Exact(59)
A principal reason for this was that negatives frequently changed hands.
Strikes and warnings of more to come have been a principal reason for gloom.
They are a principal reason for the nation's low esteem of Congress.
It is also a principal reason why Saddam Hussein has suppressed Shiism.
He understood that they were a principal reason the firm was so profitable".
Saudi Arabia's refusal to cut oil production last year is a principal reason for the current, dramatic fall in prices.
As in any other field, a principal reason why genealogical consultants fail is the lack of preparation and sound positioning.
A principal reason that medical experts have advocated narcotics in older patients is the belief that they reduce such problems.
Blacks were obliged to live separately from whites, a principal reason for his having left Johannesburg in the first place.
"And this is being done when people acknowledge the unregulated O.T.C. derivatives market was a principal reason for the meltdown".
If Syriza wins but does not take power, a principal reason will be fear of how the EU will respond.
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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