define the term echo in about 60 words
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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. You were frightened when you thought someone was following you, until you realized you were only hearing the echo of your own footsteps
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a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other obstructing surface. a sound heard again near its source after being reflected
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