echo

(noun): A reflected sound that is heard again by its initial observer.
(noun): An utterance repeating what has just been said.
(noun): A device in verse in which a line ends with a word which recalls the sound of the last word of the preceding line.
(noun): Sympathetic recognition; response; answer.
(noun): The displaying on the command line of the command that has just been executed.
(noun): The letter E in the ICAO spelling alphabet.
(noun): (whist) A signal, played in the same manner as a trump signal, made by a player who holds four or more trumps (or, as played by some, exactly three trumps) and whose partner has led trumps or signalled for trumps.
(noun): (whist) A signal showing the number held of a plain suit when a high card in that suit is led by one's partner.
(verb): (of a sound or sound waves) To reflect off a surface and return.
(verb): To reflect back (a sound).
(verb): (by extension) To repeat (another's speech, opinion etc.).
(verb): To repeat its input as input to some other device or system.
(verb): (whist) To give the echo signal, informing one's partner about cards one holds.
(noun): The visual image formed by an echocardiograph.
(noun): The use of ultrasound to produce images of the heart.