Quick definitions from WordNet (echo)

▸ noun:  the persistence of a sound after its source has stopped
▸ noun:  a reply that repeats what has just been said
▸ noun:  (Greek mythology) a nymph who was spurned by Narcissus and pined away until only her voice remained
▸ verb:  call to mind ("His words echoed John F. Kennedy")
▸ verb:  ring or echo with sound
▸ verb:  to say again or imitate ("Followers echoing the cries of their leaders")
▸ name:  A female given name (rare: 1 in 50000 females; popularity rank in the U.S.: #2995)

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▸ Also see echo