The Collaborative International Dictionary of English v.0.48:

Charta \Char"ta\ (k[aum]r"t[.a]), n. [L., leaf of paper. See
   Chart.] (Law)
   (a) Material on which instruments, books, etc., are written;
       parchment or paper.
   (b) A charter or deed; a writing by which a grant is made.
       See Magna Charta.
       [1913 Webster]