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long wave

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noun
  1. Electricity. an electromagnetic wave over 60 meters in length.
  2. L wave.
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Origin of long wave

First recorded in 1830–40
Related formslong-wave, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for long wave

long wave

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