Webster's English Dictionary

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echo

1. echo \'ek-(.)o-\ n or ech.oes [ME ecco, fr. MF & L; MF echo, fr. L, fr. 
   Gk e-cho-; ak] pl in to L vagire to wail, Gk e-che- sound 1a: the 
   repetition of a sound caused by reflection of sound waves  1b: the sound 
   due to such reflection  2a: a repetition or imitation of another : 
   REFLECTION  2b: REPERCUSSION, RESULT  2c: TRACE  2d: RESPONSE  3: one who 
   closely imitates or repeats another's words, ideas, or acts  4: a soft 
   repetition of a musical phrase  5a: the repetition of a received radio 
   signal due esp. to reflection of par t of the wave from an ionized layer of 
   the atmosphere 5b1: the reflection of transmitted radar signals by an 
   object  5b2: the visual indication of this reflection on a radarscope 
2. echo \'ek-(.)o--in, 'ek-*-win\ vb or echo.ing 1: to resound with echoes  
   2: to produce an echo  1: REPEAT, IMITATE  2: to send back or repeat (a 
   sound) by the reflection of sound waves Echo  : - a communications code 
   word for the letter e