noun

• (poetry) A device in verse in which a line ends with a word which recalls the sound of the last word of the preceding line.
• (figurative) Sympathetic recognition; response; answer.
  "Fame is the echo of actions, resounding them."
• (figurative) Something that reflects or hearkens back to an earlier thing.
  "The frustration with the political process that in the '60s led to the formation of resistance groups finds an echo in today's increasingly confrontational tactics."
• (figurative) An insignificant indirect result; a ripple.

verb

• (intransitive) Of a sound or sound waves: to reflect off a surface and return; to reverberate or resound.
  "With each clap of thunder echoing from one high building to another the noise was terrific."
• (intransitive, figuratively) Of a rumour, opinion, etc.: to spread or reverberate.
  "The sense that it takes outrageous fortune to get inoculated echoes here in the Bay Area, where pharmacies have canceled flu-shot clinics, doctors turn away pleading patients and health officials are reduced to telling panicked callers that they should practice good personal hygiene."
• (transitive) To reflect back (a sound).
  "Those peals are echoed by the Trojan throng."
• (transitive, figuratively) To repeat (another’s speech, opinion, etc.).
  "Sid echoed his father’s point of view."

name

• (Greek mythology) An oread, punished by Hera by losing her own voice and only being able to mimic that of others.
• (astronomy) 60 Echo, a main belt asteroid.