The Collaborative International Dictionary of English v.0.48:

Excerption \Ex*cerp"tion\, n. [L. excerptio.]
   1. The act of excerpting or selecting. [R.]
      [1913 Webster]

   2. That which is selected or gleaned; an extract. [R.]
      [1913 Webster]

            His excerptions out of the Fathers.   --Fuller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

excerption
    n 1: a passage selected from a larger work; "he presented
         excerpts from William James' philosophical writings" [syn:
         excerpt, excerption, extract, selection]