The Collaborative International Dictionary of English v.0.48:

Postpose \Post*pose"\, v. t. [imp. & p. p. Postposed; p. pr. &
   vb. n. Postposing.] [F. postposer. See Post-, and Pose,
   v. t.]
   To postpone. [Obs.] --Fuller.
   [1913 Webster]