Source : Webster's Revised Unabridged Dictionary (1913)

Tenno \Ten*no"\, n. [Jap. tenn[=o], fr. Chin. t'ien heaven +
   wang king.]
   Lit., King of Heaven; -- a title of the emperor of Japan as
   the head of the Shinto religion.

Source : WordNet®

tenno
     n : the emperor of Japan; when regarded as a religious leader
         the emperor is called tenno [syn: {mikado}]