Meaning & use
postulation
The act of putting forward an assumption as true, without proof, to serve as a basis for reasoning.
See it in a sentence
The theory rests on the postulation that all particles behave the same way at that scale.
His postulation about the missing manuscript's author was never confirmed by historians.
A note on using this word
Postulation is more formal and less common than 'assumption'; it appears mostly in scientific, mathematical, or philosophical writing.
Words with a similar meaning
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