[ek-oh-loh-key-shuh n] /ˌɛk oʊ loʊˈkeɪ ʃən/

the general method of locating objects by determining the time for an to return and the direction from which it returns, as by radar or sonar.
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.
determination of the position of an object by measuring the time taken for an echo to return from it and its direction

1944, from echo (n.) + location.
Sonar, especially of animals, such as bats and toothed whales. See more at sonar.


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