What does SUPPOSE mean?

verb

1. express a supposition“Let us say that he did not tell the truth”
2. expect, believe, or suppose“I imagine she earned a lot of money with her new novel”
3. to believe especially on uncertain or tentative grounds“Scientists supposed that large dinosaurs lived in swamps”
4. take for granted or as a given; suppose beforehand“I presuppose that you have done your work”
5. require as a necessary antecedent or precondition“This step presupposes two prior ones”