DictionarypresuppositionPrior assumption
noun

presupposition

pree-sup-uh-ZISH-un/ˌpriːsʌpəˈzɪʃn/

An assumption taken for granted before reasoning or speaking.

Their route planning rests on the presupposition that the bridge connects both banks.

Two colleagues discuss route with simple diagram on table; shared thought bubble shows bridge they take for granted, while route map visibly depends on that bridge joining river banks.
Etymology

The pieces suggest something placed underneath beforehand: an assumption serving as a basis. A presupposition is taken as already established before the reasoning or discussion begins.

In context

Modern-Day Debate12:11
i don't think his conclusion was based off of that as a presupposition i think it's a conclusion based off the evidence
Is There Something to Alien Abductions? | Dr Hugh Ross Vs TJump

More examples

  • Asking why he quit carries the presupposition that he quit.
  • The budget reflects a presupposition that prices will remain stable.
  • Before we debate solutions, let's examine our presuppositions.

Forms

presupposition · presuppositions

presuppose verb — To take something for granted in advance.

Similar words

assumption
Broader term for something accepted as true without proof.
premise
A starting point for an argument, often explicitly stated.