Crossword Genius

Postulate (5)

Ross

I think it could be either:

posit

axiom

'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)" .)

I've seen this clue in The Telegraph and the Evening Standard.
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