The noun presumption pretty much means jumping to conclusions. It is taking something for granted — an idea, an answer, an event — without having any real knowledge about it, and that is usually not a good thing.

Making a presumption means assuming something is true or false without getting all the information necessary for verification. You can decipher this from the prefix pre, which means "before," together with the sume — from the Latin sumere, "to take." Because so many times a presumption turns out to be false, the word has a negative connotation to it; there's something reckless about making up your mind before you know all the facts.

Definitions of presumption

n an assumption that is taken for granted

given, precondition
Type of:
assumption, supposal, supposition
a hypothesis that is taken for granted

n (law) an inference of the truth of a fact from other facts proved or admitted or judicially noticed

Type of:
illation, inference
the reasoning involved in drawing a conclusion or making a logical judgment on the basis of circumstantial evidence and prior conclusions rather than on the basis of direct observation

n a kind of discourtesy in the form of an act of presuming

“his presumption was intolerable”
Type of:
discourtesy, offence, offense, offensive activity
a lack of politeness; a failure to show regard for others; wounding the feelings or others

n audacious (even arrogant) behavior that you have no right to

assumption, effrontery, presumptuousness
uppishness, uppityness
assumption of airs beyond one's station
Type of:
audaciousness, audacity
aggressive boldness or unmitigated effrontery

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