An echo is a repetition or imitation of sound. When sound waves hit a hard surface they might reflect, making the sound bounce and repeat. If you agree with someone, you might echo his or her statement.

Poet Don Marquis said, “Writing a book of poetry is like dropping a rose petal down the Grand Canyon and waiting for the echo.” The word echo came from the Greek word for "sound." In Greek mythology, Echo was a nymph who could only repeat the last words of others. You were frightened when you thought someone was following you, until you realized you were only hearing the echo of your own footsteps.

Definitions of echo
  1. noun
    the repetition of a sound resulting from reflection of the sound waves
    “she could hear echoes of her own footsteps”
    synonyms: replication, reverberation, sound reflection
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    the echo of an echo
    type of:
    reflection, reflectivity, reflexion
    the ability to reflect beams or rays
  2. noun
    a reflected television or radio or radar beam
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    type of:
    reflection, reflectivity, reflexion
    the ability to reflect beams or rays
  3. verb
    ring or echo with sound
    synonyms: resound, reverberate, ring
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    sound in sympathy
    repeat or return an echo again or repeatedly; send (an echo) back
    echo repeatedly, echo again and again
    ring loudly and deeply
    type of:
    go, sound
    make a certain noise or sound
  4. noun
    a reply that repeats what has just been said
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    an infant's repetition of sounds uttered by others
    type of:
    reply, response
    the speech act of continuing a conversational exchange
  5. noun
    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”
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    type of:
    analog, analogue, parallel
    something having the property of being analogous to something else
  6. noun
    an imitation or repetition
    “the flower arrangement was created as an echo of a client's still life”
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    type of:
    copying (or trying to copy) the actions of someone else
  7. verb
    to say again or imitate
    “followers echoing the cries of their leaders”
    synonyms: repeat
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    repeat aloud from memory
    repeat monotonously, like a cuckoo repeats his call
    repeat back like an echo
    repeat mindlessly
    regurgitate, reproduce
    repeat after memorization
    spell, spell out
    orally recite the letters of or give the spelling of
    recite or repeat a fixed text
    rattle down, rattle off, reel off, roll off, spiel off
    recite volubly or extravagantly
    name or recite the numbers in ascending order
    type of:
    emit, let loose, let out, utter
    express audibly; utter sounds (not necessarily words)
  8. verb
    call to mind
    “His words echoed John F. Kennedy”
    synonyms: recall
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    type of:
    appear like; be similar or bear a likeness to
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