Source : Webster's Revised Unabridged Dictionary (1913)

Comprint \Com*print"\, v. t. & i.
   1. To print together.

   2. (O. Eng. Law) To print surreptitiously a work belonging to
      another. --E. Phillips.

Comprint \Com"print\, n. (O. Eng. Law)
   The surreptitious printing of another's copy or book; a work
   thus printed.