The Collaborative International Dictionary of English v.0.48:

Dispersed \Dis*persed"\, a.
   Scattered. -- Dis*pers"ed*ly, adv. -- Dis*pers"ed*ness,
   n.
   [1913 Webster]

   Dispersed harmony (Mus.), harmony in which the tones
      composing the chord are widely separated, as by an octave
      or more.
      [1913 Webster]