• WordNet 3.6
    • v echo to say again or imitate "followers echoing the cries of their leaders"
    • v echo ring or echo with sound "the hall resounded with laughter"
    • v echo call to mind "His words echoed John F. Kennedy"
    • n echo an imitation or repetition "the flower arrangement was created as an echo of a client's still life"
    • n echo a close parallel of a feeling, idea, style, etc. "his contention contains more than an echo of Rousseau","Napoleon III was an echo of the mighty Emperor but an infinitely better man"
    • n echo the repetition of a sound resulting from reflection of the sound waves "she could hear echoes of her own footsteps"
    • n echo a reflected television or radio or radar beam
    • n echo a reply that repeats what has just been said
    • n Echo (Greek mythology) a nymph who was spurned by Narcissus and pined away until only her voice remained
    • ***

Additional illustrations & photos:


Webster's Revised Unabridged Dictionary
  • Interesting fact: A duck's quack doesn't echo, and no one knows why.
    • Echo A nymph, the daughter of Air and Earth, who, for love of Narcissus, pined away until nothing was left of her but her voice.
    • Echo (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.
    • Echo (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.
    • Echo 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.""The woods shall answer, and the echo ring."
    • Echo A wood or mountain nymph, regarded as repeating, and causing the reverberation of them.
    • Echo Fig.: Sympathetic recognition; response; answer. "Fame is the echo of actions, resounding them.""Many kind, and sincere speeches found an echo in his heart."
    • v. i Echo To give an echo; to resound; to be sounded back; as, the hall echoed with acclamations. "Echoing noise."
    • Echo 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."
    • Echo To send back (a sound); to repeat in sound; to reverberate. "Those peals are echoed by the Trojan throng.""The wondrous sound
      Is echoed on forever."
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Recent scientific research has has shown Duck's quacks DO echo, even though they are commonly thought not to because the echo is can not be heard by the human ear.
    • n echo A sound repeated by reflection or reverberation from some obstructing surface; sound heard again at its source; repercussion of sound: as, an echo from a distant hill. Sound being produced by waves or pulses of the air, when such waves meet an opposing surface, as a wall, they are reflected like light-waves (see reflection); the sound so heard, as if originating behind the reflecting surface, is an echo. The echo of a sound returns to the point whence the sound originated if the reflecting surface is at right angles to a line drawn to it from that point. An oblique surface reflects the sound in another direction, so that it may be heard elsewhere, though not at the point where the sound originated. If the direct and reflected sounds succeed one another with great rapidity, which happens when the reflecting surface is near, the echo only clouds the original sound, but is not heard distinctly; and it is such indistinct echoes that interfere with the hearing in churches and other large buildings. An interval of about one ninth of a second is necessary to discriminate two successive sounds; and as sound passes through the atmosphere at the rate of about 1,125 feet in a second, of 1,125, or about 62 feet, will be the least distance at which an echo can be heard; and this will be distinct only in the case of a sharp, sudden sound. The walls of a house or the ramparts of a city, the surface of a cloud, a wood, rocks, mountains, and valleys produce echoes. Some echoes are remarkable for their frequency of repetition, and are called multiple or tautological echoes.
    • n echo [capitalized] In classical mythology, an oread or mountain nymph, who, according to a usual form of the myth, pined away for love of the beautiful youth Narcissus till nothing remained of her but her voice.
    • n echo Figuratively, a repetition of the sentiments of others; reproduction of the ideas or opinions of others, either in speech or in writing.
    • n echo In music, the very soft repetition of a short phrase, particularly in orchestral or organ music. In large organs an echo-organ is sometimes provided for echo-like effects; it consists of pipes shut up in a tight box, or removed to a distance from the organ proper, and controlled by a separate keyboard or by separate stops. A single stop so used or placed is called an echo-stop.
    • n echo In architecture, a wall or vault, etc., having the property of reflecting sounds or of producing an echo.
    • n echo [capitalized] [NL.] In zoology, a genus of neuropterous insects.
    • echo To emit an echo; reflect or repeat sound; give forth an answering sound by or as if by echo.
    • echo To be reflected or repeated by or as if by echo; return or be conveyed to the ear in repetition; pass along by reverberation.
    • echo To produce a reverberating sound; give out a loud sound.
    • echo To emit an echo of; reflect the sound of, either directly or obliquely; cause to be heard by reverberation: as the whispering gallery of St. Paul's in London echoes very faint sounds.
    • echo To repeat as if by way of echo; emit a reproduction of, as sounds, words, or sentiments; imitate the sound or significance of.
    • echo To imitate as an echo; repeat or reproduce the sounds, utterances, or sentiments of: as, the mocking-bird echoes nearly all other creatures; to echo a popular author.
    • n echo In whist, a response to a partner's signal for trumps.
    • n echo In bridge, a method of showing the leader how many cards his partner holds in the suit led, or of indicating that the third hand can trump the third round. The first is called the plain-suit echo, the second the down-and-out echo.
    • echo In bridge, to show the leader how many cards the third hand holds in the suit led.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: When you put a seashell to your ear, the sound you hear is not the waves, but actually the echo of the blood pulsing in your own ear.
    • n Echo ek′ō the repetition of sound caused by a sound-wave coming against some opposing surface, and being reflected: a device in verse in which a line ends with a word which recalls the sound of the last word of the preceding line: imitation: an imitator
    • v.i Echo to reflect sound: to be sounded back: to resound
    • v.t Echo to send back the sound of: to repeat a thing said: to imitate: to flatter slavishly:—pr.p. ech′ōing; pa.p. ech′ōed
    • ***


  • Arabian Proverb
    Arabian Proverb
    “I came to the place of my birth and cried, The friends of my youth, where are they? And echo answered, Where are they?”
  • Eric Hoffer
    “It is not so much the example of others we imitate as the reflection of ourselves in their eyes and the echo of ourselves in their words.”
  • Thomas Fuller
    “Fame is the echo of actions, resounding them to the world, save that the echo repeats only the last art, but fame relates all, and often more than all.”
  • Mother Teresa
    “Kind words can be short and easy to speak, but their echoes are truly endless.”
  • Eliza Cook
    Eliza Cook
    “Oh, how cruelly sweet are the echoes that start when memory plays an old tune on the heart!”
  • John A. Shedd
    John A. Shedd
    “When there is an original sound in the world, it makes a hundred echoes.”


Webster's Revised Unabridged Dictionary
L. echo, Gr. 'hchw` echo, sound, akin to 'hchh` 'h^chos, sound, noise; cf. Skr. vāç, to sound, bellow; perh. akin to E. voice,: cf. F. écho,


In literature:

Percy echoed the wish, silently but fervently.
"Jim Spurling, Fisherman" by Albert Walter Tolman
In the empty house the least noise echoed greatly.
"A Daughter of Raasay" by William MacLeod Raine
A hoarse shout blended with it, and then the report of a revolver-shot echoed through the place.
"The Rider of Waroona" by Firth Scott
Spring echoes sounded from blue distances; the solemn congress of the forest trees in session murmured of summers past and summers to come.
"A Young Man in a Hurry" by Robert W. Chambers
It sounded like the echo of some far-away bell.
"Master of the Vineyard" by Myrtle Reed
The mock-bird echoes back the laugh: but not so Marian.
"The Wild Huntress" by Mayne Reid
You seem to hear the sound of the Almighty's footsteps still echoing amid these hills.
"Pilgrimage from the Alps to the Tiber" by James Aitken Wylie
The crowd echoed his sigh and their voices rose quickly.
"Deathworld" by Harry Harrison
She inquired about trains and rates to Echo, Idaho!
"Sawtooth Ranch" by B. M. Bower
Shouts echoed against the heavy stone walls.
"The Saracen: The Holy War" by Robert Shea

In poetry:

Even--"Come Eurydice!"
The sea rolls on in pain,
Echoing the note again:
"Lost, lost Eurydice!"
"Eurydice" by Sophie Margaret Hensley
"Forever and forever,
As long as life has woes,"
Thy name shall be re-echoed
On time's terrestrial shores.
"Y. M. C. A. Founder. Sir Geo. Williams." by Frank Barbour Coffin
Yet, as when dies a sound
Its spectre lingers round,
Haply my spent life will
Leave some faint echo still.
"An Autograph" by John Greenleaf Whittier
Yet not alone the mourners
In this sad tent are found;
Shriek after shriek is echoed
For many miles around.
"The Great Physician" by Mary Ann H T Bigelow
Blessed night, when first that plain
Echoed with the joyful strain,
"Peace has come to earth again."
"Blessed Night, When First That Plain" by Horatius Bonar
When the welcome summons
Shall echo through the skies,
Then our ransomed brother
Will hear the word " Arise ."
"Mr. Edward Fordham" by Mary Weston Fordham

In news:

Chris Corning, 11, rides a rail at Echo Mountain on March 28, 2011.
Nora Pykkenen is the new owner of Echo Mountain ( Handout).
Lee's surrender sword, and echoes of the Lost Cause , at new Appomattox museum.
Sandra Macleod , Echo Research.
Sandra Macleod , Echo Research, PR Week UK, Wednesday, 14 September 2011, 12:00am.
Tonight we'll listen to his piece " Mali Dje", which offers wonderful pre-echoes of traditional Blues.
Maraschino 's Historic Echo.
Bret Easton Ellis has echoed his own fiction before.
Mayflower to Clinton Gulch Loop lies below Fremont Pass and echoes with gold and silver frenzy.
Mayflower to Clinton Gulch Loop lies below Fremont Pass and echoes with gold and silver frenzy.
The plot described in court was a distant echo of the privately-financed military adventures of the 19th-century scramble for Africa and rampaging European mercenaries who roamed the continent in the decades after independence.
The rubble of Babette's Supper Club is still smoking and the echoes of last week's blast are still ringing in Nucky Thompson's ears.
A snow sculpture, echoes the nearby "Founders of Juneau" memorial, left, near the Marine View building on S.
Echo farmer Kent Madison praised the move.
It was nice to see him and to hear the echoes of Spanish in his speech.

In science:

For constant xA and xB we can write U [xA ] = exp(−iT HA/2¯h) and U [xB ] = exp(−iT HB/2¯h), leading to the currently prevailing definition of the fidelity, also know as Loschmidt echo, as a measure for quantum irreversibility .
Quantum Irreversibility of Energy Spreading
Such a temperature dependence has been reported at least once before: in a neutron spin-echo experiment on the high-temperature dynamics of glycerol .
Structural Relaxation and Mode Coupling in a Simple Liquid: Depolarized Light Scattering in Benzene
As echoed repeatedly in this survey, recommendation is an inherently social process and recommender systems ultimately connect people.
A Connection-Centric Survey of Recommender Systems Research
This echoes the non-monotonous dependence on σ2 of the peak height of a lognormal distribution f (see eq. (15) and related comments).
Broad distribution effects in sums of lognormal random variables
The arc “echo” in 3C 280 (if real) might be difficult to account for in this picture.
The Aligned z ~ 1 Radio Galaxy 3C 280