To presuppose is to take something as a given; presupposing is like assuming.

When you suppose something is true, you assume it's true; to presuppose means something similar. The pre — which means "before" — is a reminder that what you're assuming is background or pretext for something else. Asking “Want soup?” presupposes someone is hungry. Asking a woman "When is the baby due?" presupposes that she’s pregnant. Presupposing can be dangerous: if your presuppositions are incorrect, you could jump to the wrong conclusion.

Definitions of presuppose
  1. verb
    take for granted or as a given; suppose beforehand
    “I presuppose that you have done your work”
    synonyms: suppose
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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
  2. verb
    require as a necessary antecedent or precondition
    “This step presupposes two prior ones”
    synonyms: suppose
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    type of:
    suggest as a logically necessary consequence; in logic
Word Family

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