The Collaborative International Dictionary of English v.0.48:

Impressment \Im*press"ment\ ([i^]m*pr[e^]s"ment), n.
   The act of seizing for public use, or of impressing into
   public service; compulsion to serve; as, the impressment of
   provisions or of sailors.
   [1913 Webster]

         The great scandal of our naval service -- impressment
         -- died a protracted death.              --J. H.
                                                  Burton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

impressment
    n 1: the act of coercing someone into government service [syn:
         impress, impressment]