Source : Webster's Revised Unabridged Dictionary (1913)

Echo \Ech"o\, n.; pl. {Echoes}. [L. echo, Gr. ? echo, sound,
   akin to ?, ?, sound, noise; cf. Skr. v[=a]? to sound, bellow;
   perh. akin to E. voice: cf. F. ['e]cho.]
   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.

   2. Fig.: Sympathetic recognition; response; answer.

            Fame is the echo of actions, resounding them.
                                                  --Fuller.

            Many kind, and sincere speeches found an echo in his
            heart.                                --R. L.
                                                  Stevenson.

   3.
      (a) (Myth. & Poetic) 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.
      (b) (Gr. Myth.) 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} (Mus.), a set organ pipes inclosed in a box so
      as to produce a soft, distant effect; -- generally
      superseded by the swell.

   {Echo stop} (Mus.), 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. --M. Arnold.

            I would applaud thee to the very echo, That should
            applaud again.                        --Shak.