1. Adjective.  Referring to a sound that has no visually identifiable cause.
  2. Adjective.  Referring to Pythagorean disciples who for years listened to his lectures from behind a curtain, unable to see him.
  3. Adjective.  (context, music) Referring to pre-recorded music that is presented in concert using loudspeakers, e.g. some types of computer music.

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This entry was last updated on RefTopia from its source on 3/20/2012.