prima facie evidence

from The Collaborative International Dictionary of English v.0.48

Prima facie \Pri"ma fa"ci*e\ [L., from abl. of primus first +
   abl. of facies appearance.]
   At first view; on the first appearance.
   [1913 Webster]

   {Prima facie evidence} (of a fact) (Law), evidence which is
      sufficient to establish the fact unless rebutted.
      --Bouvier.
      [1913 Webster]