What do a.m. and p.m. stand for?

sound ranging

a method for determining the distance between a point and the position of a sound source by measuring the time lapse between the origin of the sound and its arrival at the point. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for sound ranging
  • If you listen quietly you will discover that each spring has a unique sound ranging from a loud roar to a soft splashing.
  • Diagram of sound ranging coverage with artillery firing possibilities.
British Dictionary definitions for sound ranging

sound ranging

the determination of the location of a source of sound waves by measuring the time lapse between their transmission and their reception at microphones situated at three or more known positions
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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