to assume (something), as for the sake of argument or as part of a proposition or theory

Suppose the distance to be one mile.

to consider (something) as a possibility suggested or an idea or plan proposed

Suppose we wait until tomorrow.

to believe or assume as true; take for granted

It is supposed that his death was an accident.

to think or hold as an opinion

What do you suppose he will do?

to require logically; imply; presuppose

The evidence supposes his presence near the scene.

(used in the passive) to expect or design; require or permit (fol. by an infinitive verb)

The machine is supposed to make noise. I'm not supposed to run fast.

to assume something; presume; think.