The Collaborative International Dictionary of English v.0.48:

Copying \Cop"y*ing\, a. & n.
   From Copy, v.
   [1913 Webster]

   Copying ink. See under Ink.

   Copying paper, thin unsized paper used for taking copies of
      letters, etc., in a copying press.

   Copying press, a machine for taking by pressure, an exact
      copy of letters, etc., written in copying ink.
      [1913 Webster]