Glossary of Terms
 
  echo  
  1) One distinct repeat of a sound caused by the sound reflecting off a surface.
2) Loosely used to mean reverberation (the continuing of a sound after the source stops emitting it, caused by many discrete echoes closely spaced in time).
 
  Source: Recording Institute of Detroit  

Also refered as:
  delay
Related terms:
  echo chamber   reverb