If you suppose you love your girlfriend, you may not be too sure. Suppose means to guess, or think, or imagine something without absolute certainty. Best hold off on the engagement ring until you know for sure!

Suppose also has the meaning of assuming something hypothetical for the sake of argument. You might ask, "Suppose someone breaks in while I'm away?" Suppose also has the more technical (and often legal) sense of something you must take for granted if some other condition is to happen. Your theory might suppose the victim was home by 8:00. In this last sense, suppose introduces something that's a precondition.

Definitions of suppose
  1. verb
    expect or believe
    synonyms: guess, imagine, opine, reckon, think
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    hold in suspicion; believe to be guilty
    type of:
    anticipate, expect
    regard something as probable or likely
  2. verb
    express a supposition
    synonyms: say
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    type of:
    talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
  3. verb
    believe especially on uncertain or tentative grounds
    “Scientists supposed that large dinosaurs lived in swamps”
    synonyms: conjecture, hypothecate, hypothesise, hypothesize, speculate, theorise, theorize
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    construct, reconstruct, retrace
    reassemble mentally
    develop, explicate, formulate
    elaborate, as of theories and hypotheses
    etymologise, etymologize
    construct the history of words
    develop and work out fully in one's mind
    redevelop, reformulate
    formulate or develop again, of an improved theory or hypothesis
    type of:
    anticipate, expect
    regard something as probable or likely
  4. verb
    take for granted or as a given; suppose beforehand
    synonyms: presuppose
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    posit, postulate
    take as a given; assume as a postulate or axiom
    premise, premiss
    take something as preexisting and given
    assert, insist
    assert to be true
    type of:
    assume, presume, take for granted
    take to be the case or to be true; accept without verification or proof
  5. verb
    require as a necessary antecedent or precondition
    synonyms: presuppose
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    type of:
    suggest as a logically necessary consequence; in logic
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