Source : Webster's Revised Unabridged Dictionary (1913)

Sunna \Sun"na\, n. [Ar. sunnah rule, law.]
   A collection of traditions received by the orthodox
   Mohammedans as of equal authority with the Koran.

Source : WordNet®

Sunna
     n : (Islam) the way of life prescribed as normative for Muslims
         on the basis of the teachings and practices of Muhammad
         and interpretations of the Koran [syn: {Sunnah}, {hadith}]