Source : Webster's Revised Unabridged Dictionary (1913)

Postulate \Pos"tu*late\, v. t. [imp. & p. p. {Postulated}; p.
   pr. & vb. n. {Postulating}.]
   1. To beg, or assume without proof; as, to postulate
      conclusions.

   2. To take without express consent; to assume.

            The Byzantine emperors appear to have . . .
            postulated a sort of paramount supremacy over this
            nation.                               --W. Tooke.

   3. To invite earnestly; to solicit. [Obs.] --Bp. Burnet.