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Definition of Term

echo
(English) In acoustics, a signal which has been reflected or otherwise returned with sufficient magnitude and time delay to be detected as a signal distinct from that directly transmitted. (See also: acoustics, sonar, echo ranging)
écho
(French) Dans les acoustiques, un signal qui a été renvoyé ou autrement été revenu avec magnitude et délai du temps suffisante pour être détecté comme un signal distinct de ce qui a été directement transmis. (See also: acoustics, sonar, echo ranging)
eco
(Portuguese) Em acústica, um sinal reflectido de magnitude suficiente para ser distintamente audível após a sua emissão. (See also: acoustics, sonar, echo ranging)

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