Source : Webster's Revised Unabridged Dictionary (1913)

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

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

Source : WordNet®

prima facie
     adj : as it seems at first sight; "a prima facie case of murder"
     adv : at first sight