Source : Webster's Revised Unabridged Dictionary (1913)

Ballet \Bal"let`\, n. [F., a dim. of bal dance. See 2d {Ball},
   n.]
   1. An artistic dance performed as a theatrical entertainment,
      or an interlude, by a number of persons, usually women.
      Sometimes, a scene accompanied by pantomime and dancing.

   2. The company of persons who perform the ballet.

   3. (Mus.) A light part song, or madrigal, with a fa la burden
      or chorus, -- most common with the Elizabethan madrigal
      composers.

   4. (Her.) A bearing in coats of arms, representing one or
      more balls, which are denominated bezants, plates, etc.,
      according to color.

Source : WordNet®

ballet
     n 1: a theatrical representation of a story performed to music by
          ballet dancers [syn: {concert dance}]
     2: music written for a ballet