From The Collaborative International Dictionary of English v.0.48:

jazz \jazz\ n.
   1. A type of music that originated in New Orleans around 1900
      and developed through increasingly complex styles, but
      generally featuring intricate rhythms, improvisation,
      prominent solo segments, and great freedom in harmonic
      idiom played frequently in a polyphonic style, on various
      instruments including horn, saxophone, piano and
      percussion, but rarely stringed instruments. [WordNet
      sense 1]
      [WordNet 1.5 +PJC]

   2. empty or insincere or exaggerated talk; as, don't give me
      any of that jazz. [WordNet sense 2]

   Syn: wind, idle words, nothingness.
        [WordNet 1.5]

   3. A style of dance music popular in the 1920s; similar to
      New Orleans jazz but played by large bands.
      [WordNet 1.5]
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