Webster's Revised Unabridged Dictionary · 1913

Echo

Echo (ek"o) , noun

[Latin echo, Greek 'hchw` echo, sound, akin to 'hchh`, 'h^chos, sound, noise; compare Sanskrit vāc to sound, bellow; perh. akin to English voice: compare French écho.]

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. — Shakespeare
The woods shall answer, and the echo ring. — Pope
2.
Figuratively: 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) (Mythology & 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)
(Greek Mythology) 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
4.
(a) (Whist, Contract Bridge) A signal, played in the same manner as a trump signal, made by a player who holds four or more trumps (or as played by some exactly three trumps) and whose partner has led trumps or signaled for trumps.
(b)
(Whist, Contract Bridge) A signal showing the number held of a plain suit when a high card in that suit is led by one's partner.
I would applaud thee to the very echo, That should applaud again. — Shakespeare
Collocations (3)
Echo organ (Music) , a set organ pipes inclosed in a box so as to produce a soft, distant effect; -- generally superseded by the swell.
Echo stop (Music) , 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

Echo , transitive verb

1.
To send back (a sound); to repeat in sound; to reverberate.
Those peals are echoed by the Trojan throng. — Dryden
The wondrous sound Is echoed on forever. — Keble
2.
To repeat with assent; to respond; to adopt.
They would have echoed the praises of the men whom they envied, and then have sent to the newspaper anonymous libels upon them. — Macaulay

Echo , intransitive verb

To give an echo; to resound; to be sounded back; as, the hall echoed with acclamations.
Echoing noise. — Blackmore