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

v take for granted or as a given; suppose beforehand

“I presuppose that you have done your work”
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

v require as a necessary antecedent or precondition

“This step presupposes two prior ones”
Type of:
suggest as a logically necessary consequence; in logic

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