1.  suppose(v = verb.communication) say - express a supposition; "Let us say that he did not tell the truth"; "Let's say you had a lot of money--what would you do?"
is one way to speculate
Derived forms noun supposal₁, noun supposition₁
Sample sentences: They suppose that there was a traffic accident

2.  suppose(v = verb.cognition) guess, imagine, opine, reckon, think - expect, believe, or suppose; "I imagine she earned a lot of money with her new novel"; "I thought to find her in a bad state"; "he didn't think to find her in the kitchen"; "I guess she is angry at me for standing her up"
is one way to anticipate, expect
Derived forms noun supposal₂, noun supposition₃
Sample sentences: Somebody ----s somebody to INFINITIVE; Somebody ----s that CLAUSE

3.  suppose(v = verb.cognition) conjecture, hypothecate, hypothesise, hypothesize, speculate, theorise, theorize - to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"
is one way to anticipate, expect
Derived forms noun supposal₂, noun supposition₃
Sample sentences: Somebody ----s that CLAUSE

4.  suppose(v = verb.cognition) presuppose - take for granted or as a given; suppose beforehand; "I presuppose that you have done your work"
is one way to assume, presume, take for granted
Sample sentences: Somebody ----s that CLAUSE

5.  suppose(v = verb.cognition) presuppose - require as a necessary antecedent or precondition; "This step presupposes two prior ones"
is one way to imply
Sample sentences: Something ----s something

1.  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? [1913 Webster]
"Suppose they take offence without a cause." [1913 Webster]
"When we have as great assurance that a thing is, as we could possibly, supposing it were, we ought not to make any doubt of its existence." [1913 Webster]

2.  To imagine; to believe; to receive as true. [1913 Webster]
"How easy is a bush supposed a bear!" [1913 Webster]
"Let not my lord suppose that they have slain all the young men, the king's sons; for Amnon only is dead." [1913 Webster]

3.  To require to exist or to be true; to imply by the laws of thought or of nature; as, purpose supposes foresight. [1913 Webster]
"One falsehood always supposes another, and renders all you can say suspected." [1913 Webster]

4.  To put by fraud in the place of another. [1913 Webster]

   To make supposition; to think; to be of opinion. Acts ii. 15. [1913 Webster]

   Supposition. Dryden. [1913 Webster]

suppose, v.tr. (often foll. by that + clause)
1 assume, esp. in default of knowledge; be inclined to think (I suppose they will return; what do you suppose he meant?).
2 take as a possibility or hypothesis (let us suppose you are right).
3 (in imper.) as a formula of proposal (suppose we go to the party).
4 (of a theory or result etc.) require as a condition (design in creation supposes a creator).
5 (in imper. or pres. part. forming a question) in the circumstances that; if (suppose he won't let you; supposing we stay).
6 (as supposed adj.) generally accepted as being so; believed (his supposed brother; generally supposed to be wealthy).
7 (in passive; foll. by to + infin.) a be expected or required (was supposed to write to you). b (with neg.) not have to; not be allowed to (you are not supposed to go in there).

Idiom:
I suppose so an expression of hesitant agreement.

Derivative:
supposable adj.

Etymology:
ME f. OF supposer (as SUB-, POSE(1))

VB  suppose, conjecture, surmise, suspect, guess, divine, theorize, presume, presurmise, presuppose, assume, fancy, wis, take it, give a guess, speculate, believe, dare say, take it into one's head, take for granted, imagine, put forth, propound, propose, start, put a case, submit, move, make a motion, hazard out, throw out a suggestion, put forward a suggestion, put forward conjecture, allude to, suggest, hint, put it into one's head, suggest itself, run in the head, marvel if, wonder if, wonder whether.