Learn English – What’s the word to describe an imaginary situation that forms the basis of an argument

single-word-requests

I'm looking for the word as stated by the title?

E.g. "Hey imagine if cats actually had 9 lives. Cats would have a bigger population than humans. "

"But they don't."

"I know but in the context that they actually did have 9 lives".

What word should replace in the context? Basis,premise,conjecture??

Best Answer

It might be called assumption:

something taken for granted; a supposition:
a correct assumption.

or premise

a proposition antecedently supposed or proved as a basis of argument or inference;

or presupposition:

presuppose: to require as an antecedent in logic or fact

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