1. A sound reflected from an opposing surface and repeated to the ear of a listener; repercussion of sound; repetition of a sound. The babbling echo mocks the hounds. (Shak) The woods shall answer, and the echo ring. (Pope)
3. A wood or mountain nymph, regarded as repeating, and causing the reverberation of them. Sweet echo, sweetest nymph, that liv'st unseen within thy airy shell. (Milton) a nymph, the daughter of air and earth, who, for love of narcissus, pined away until nothing was left of her but her voice. Compelled me to awake the courteous echo to give me answer from her mossy couch. (Milton) echo organ, a stop upon a harpsichord contrived for producing the soft effect of distant sound. To applaud to the echo, to give loud and continuous applause. I would applaud thee to the very echo, That should applaud again. (Shak) The persistence of a sound after its source has stopped.