Suggestions(1)
"The proposition" is correct and usable in written English.
You can use it to refer to a proposal or idea that has been put forward. For example, "The proposition was discussed and eventually accepted by the board members."
Dictionary
The proposition
noun
The act of offering (an idea) for consideration.
Exact(60)
The proposition passed.
The proposition is mutually exclusive.
The proposition is just as alluring today.
The proposition passed, 57 to 43percentt.
The proposition is a seductive one.
The proposition was defeated 56%to44%4%.
The proposition can pose a problem.
The proposition is general rather than singular.
The proposition is not without risk.
The proposition p is called the "positum".
The proposition is proved now.
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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