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Discover LudwigThe word 'suppositional' is correct and usable in written English.
It means something that is based on supposition or assumption. You can use it when discussing ideas or theories that are not yet proven or confirmed. Example: The researcher presented a suppositional hypothesis about the correlation between social media use and self-esteem levels.
Dictionary
suppositional
adjective
Resting on supposition; hypothetical; conjectural.
Exact(18)
But the result of supposing an item presupposes that the information in question is indeed part of the suppositional scenario created by the supposition of the said item.
In §3 we examine what is called the suppositional theory: that conditional judgements essentially involve suppositions.
"To label books like mine 'autobiographical' or 'confessional'", he once told the French writer Alain Finkielkraut, "is not only to falsify their suppositional nature but, if I may say so, to slight whatever artfulness leads some readers to think that they must be autobiographical".
Lacking hard evidence for many of the causal chains he envisions, Keys offers a series of suppositional flow charts, each beginning with the presumed supereruption in 535.
A related distinction is made by Alvin Goldman (2006) between suppositional imagination (s-imagination) on the one hand, and enactment imagination (e-imagination) on the other.
Within the epistemic project it is s herself who supposes that q is false i.e., who has a suppositional doubt about q (where s's suppositional doubt about q is compatible with s's actually having justification for believing q or s's being entitled to believe q).
Another place in which singular terms were used was suppositional descent, as when one infers from "Every man is running" that Socrates is running or Plato is running or Cicero is running, or that this man is running, and that man is running.
Hook and the suppositional theorist (call her Supp) come spectacularly apart when p ~A) is high and p(A&B) is much smaller than p(A&~B).
These are the ways of tarka, "hypothetical" or "suppositional reasoning".
Now there is much in common between the restrictor-view of conditionals and the suppositional view.
A suppositional theory was advanced by J. L. Mackie (1973, chapter 4).
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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