Suppose

To represent to one's self, or state to another, not as true or real, but as if so, and with a view to some consequence or application which the reality would involve or admit of; to imagine or admit to exist, for the sake of argument or illustration; to assume to be true; as, let us suppose the earth to be the center of the system, what would be the result?

To imagine; to believe; to receive as true.

To require to exist or to be true; to imply by the laws of thought or of nature; as, purpose supposes foresight.

To put by fraud in the place of another.

To make supposition; to think; to be of opinion.

Supposition.

to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"