The Collaborative International Dictionary of English v.0.48:

Arraignment \Ar*raign"ment\, n. [Cf. OF. arraynement,
   aresnement.]
   1. (Law) The act of arraigning, or the state of being
      arraigned; the act of calling and setting a prisoner
      before a court to answer to an indictment or complaint.
      [1913 Webster]

   2. A calling to an account to faults; accusation.
      [1913 Webster]

            In the sixth satire, which seems only an Arraignment
            of the whole sex, there is a latent admonition.
                                                  --Dryden.
      [1913 Webster] Arraiment

WordNet (r) 3.0 (2006):

arraignment
    n 1: a legal document calling someone to court to answer an
         indictment