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  1. A sound reflected off a surface that arrives at the listener after the direct sound. Sometimes thought of as reverberation, but an echo is very distinct while reverberation is a mixed together sound which decays gradually.
  2. An effect produced by a signal processor to achieve the results in number 1, above.
  3. A control (signal path) on a mixer used to send part of the signal to a signal processor which creates the desired echo effect. (Very similar to a post-fade auxiliary control.) Source: Church Audio & Acoustics Glossary
  4. Reflected sound wave that arrives with sufficient magnitude and time delay as to be distinguishable from a sound wave received directly from a source. Source: Glossary of Terms in Noise Control Engineering
  5. A delayed return of sound that is perceived by the ear as a discrete sound image. Source: http://www.owenscorning.com/around/sound/glossary.asp

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