Source : Webster's Revised Unabridged Dictionary (1913)

Mishna \Mish"na\, n. [NHeb. mishn[=a]h, i. e., repetition,
   doubling, explanation (of the divine law), fr. Heb.
   sh[=a]n[=a]h to change, to repeat.]
   A collection or digest of Jewish traditions and explanations
   of Scripture, forming the text of the Talmud. [Written also
   {Mischna}.]

Source : WordNet®

Mishna
     n : the first part of the Talmud; a collection of early oral
         interpretations of the scriptures that was compiled about
         AD 200 [syn: {Mishnah}]