Source : Webster's Revised Unabridged Dictionary (1913)

Postulation \Pos`tu*la"tion\, n. [L. postulatio: cf. F.
   postulation.]
   The act of postulating, or that which is postulated;
   assumption; solicitation; suit; cause.

Source : WordNet®

postulation
     n 1: (logic) a declaration of something self-evident; something
          that can be assumed as the basis for argument [syn: {predication}]
     2: a formal message requesting something that is submitted to
        an authority [syn: {request}, {petition}]