Postulate (5)
'postulate' is the definition.
(I know that postulate can be written as posit)
This is all the clue.
(Other definitions for posit that I've seen before include "Put forward (something) as a given" , "Put forward as true" , "Put forward; place" , "Assume as fact for argument's sake" , "Put forward (as fact)" .)
'postulate' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for axiom that I've seen before include "A saying that's widely accepted as true" , "that's self-evident" , "Principle; assumption" , "Generally accepted truism" , "Accepted general truth or principle" .)