from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The technique of using reflected pulses of sound to determine depth or the location of objects (or fish) under water.
  • noun A particular measurement made using this technique.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun determining the location of something by measuring the time it takes for an echo to return from it


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