postulate: [16] The noun postulate originally meant ‘demand, request’. It was an anglicization of postulātum, a noun use of the past participle of postulāre ‘demand, request’. It was used in the mid-17th century by mathematicians and logicians for a proposition that (because it was a simple or uncontentious one) ‘demanded’ to be taken for granted for the sake of further reasoning, and from this it spread to more general usage. The notion of ‘requesting’ is better preserved in postulant [18], from the present participle of the Latin verb.
