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echolocation

[ek-oh-loh-key-shuh n] /ˌɛk oʊ loʊˈkeɪ ʃən/
noun
1.
the general method of locating objects by determining the time for an echo to return and the direction from which it returns, as by radar or sonar.
2.
Zoology. the sonarlike system used by dolphins, bats, and other animals to detect and locate objects by emitting usually high-pitched sounds that reflect off the object and return to the animal's ears or other sensory receptors.
Origin
1944
1944; echo + location
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for echo-location

echolocation

/ˌɛkəʊləʊˈkeɪʃən/
noun
1.
determination of the position of an object by measuring the time taken for an echo to return from it and its direction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for echo-location

echolocation

n.

1944, from echo (n.) + location.

Online Etymology Dictionary, © 2010 Douglas Harper
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echo-location in Science
echolocation
  (ěk'ō-lō-kā'shən)   
Sonar, especially of animals, such as bats and toothed whales. See more at sonar.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Difficulty index for echolocation

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Word Value for echo

9
9
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