A sound or series of sounds caused by the reflection of sound waves from a surface back to the listener. The echo of her voice could be heard in the empty hall.
A close parallel or repetition of an idea, feeling, style, or event. The new policy is an echo of the previous administration's approach.
A person who reflects or imitates another. He was often seen as an echo of his mentor, adopting similar mannerisms and ideas.
A reflected radar, sonar, or other electronic signal. The radar screen displayed a faint echo to the east.