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long wave

noun
1.
Electricity. an electromagnetic wave over 60 meters in length.
2.
Origin of long wave
1830-1840
First recorded in 1830-40
Related forms
long-wave, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for long wave

long wave

noun
1.
  1. a radio wave with a wavelength greater than 1000 metres
  2. (as modifier): a long-wave broadcast
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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