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.