Echo is a term used to describe the REPETITION of sound waves, often in the form of a RESPONSE or REVERBERATION. The crossword solutions for the term echo include DUPLICATE (9 letters), REPLY (5 letters), IMITATION (9 letters), REPERCUSSION (12 letters), RESEMBLE (8 letters), duplication (11 letters), REPETITION (10 letters), RESONATE (8 letters), REITERATION (11 letters), RESONANCE (9 letters), RESPONSE (8 letters), COPY (4 letters), RESPOND (7 letters), RECOUNT (7 letters), IMPERSONATE (11 letters), REFLECTION (10 letters), REACT (5 letters), REFLECT (7 letters), REVERBERATION (13 letters), APE (3 letters), asdic (5 letters), RING (4 letters), ANSWER (6 letters), PARROT (6 letters), REPEAT (6 letters), REVERB (6 letters), IMITATE (7 letters), ITERATE (7 letters), REBOUND (7 letters), RESOUND (7 letters), REITERATE (9 letters), REVERBERATE (11 letters), saythesamething (15 letters). These words all describe different aspects of the concept of echo, from the physical act of repeating sound waves to the idea of IMITATION and REFLECTION.